Sorry for not posting in a while. Weekends are a busy time for me.
Hopefully I can go back to my normal schedule.
Part 4: Poland, the Neighbor (1383-1384)
After the baptism of Jogaila and the defeat of Kęstutis, the Grand Duchy of Lithuania saw a few years of peace. Jogaila granted a few acts of privileges to the newly established diocese of Vilnius, beginning a period of Christianization within the ethnic Lithuanian lands. On the last months of 1383, 500 Lithuanian nobles and priests were baptized along the Neris river in Orthodox rites, and Jogaila released an act granting higher privileges to "all Christian nobles of Lithuanian birth". On 1383, an official letter from Pope Urban VI arrived to the court of the Grand Duke, declaring that "while it is a great sight to see that this distant pagan nation has finally accepted the word of Christ, it is disheartening to see that it was baptized in Schismatic rites". The Teutonic and Livonian Orders were ordered to continue their pressure on Lithuania, on the hopes of converting it to the true, Catholic faith.
Meanwhile, Jogaila continued establishing new privileges and institution in his effort to make the Baptism of Lithuania more fulfilling. On early 1383, city rights, adjusted and similar to the Magdeburg laws common in northern Germany, Poland and Hungary, were granted to the City of Vilnius - the first one in this massive land, as well as the first Orthodox city in Europe with city law based on the German laws. The citizens of Vilnius were allowed to elect their own autonomous institutions and freely participate in crafts and trade. Jews across the entire Grand Duchy also received similar privileges, though regardless of their location.
While all of this was great and all, a much more important series of events was unfolding right to the west of Lithuania... Upon the death of Louis I of Hungary and Poland, the new King of Poland, according to the ruler's will, was to be his elder daughter Mary, married to Sigismund of Luxemburg, the King of Hungary. While this preserved the personal union between Poland and Hungary, it ended up being hugely controversial among the Polish nobility. Both the continuation of the personal union and Sigismund were hugely unpopular, especially among the nobles of Greater Poland, many of whom also saw this as an opportunity to reinstall the Piast dynasty through the leader of their anti-Angevin coalition - Siemowit IV, the Duke of Mazovia.
Siemowit IV, the strongest surviving ruler of the Piast dynasty, had only recently inherited the Duchy of Mazovia from his father, also named Siemowit. A determined man, he was willing to take hold of the Crown at any cost. In 1383, the
Greater Poland Civil War, between the anti-Angevin Nalęcz families and the pro-Angevin Grzymala families, with the nobility of Lesser Poland in between, despite the court of Sigismund and the underage Mary still debating a compromise to please both sides. In a meeting of szlachta and other lesser nobles under Siemowit's side in Sieradz, the Duke of Mazovia announced his war for the claim on the Polish throne, under the rights of "restoring the dynasty that reigned this land for thousands of years, starting with the first Piasts to Casimir III, and abolishing the union between Poland and Hungary".
Meanwhile, the Dowager Queen, Elizabeth of Bosnia, the wife of the dead Louis I, sent an official declaration to the Polish nobility - the will of her husband will not be changed, Mary will inherit the throne of Poland, and the regent called all Polish nobles to arms to defeat Siemowit IV. Not all that many of them responded, but certainly enough to challenge the pretender from Mazovia. This time, Lesser Poland joined the side of the Angevin dynasty, fearing that a Masovian victory would lead to Greater Poland dominating all affairs of the state. The first battles of the Civil War were short and quick, more resembling raiding parties than military campaigns. Siemowit's forces attacked Bydgoszcz and Lodz, while Angevin detachments raided southern Masovia. Despite the chaos at home due to numerous revolts taking advantage of Mary's unstable reign, the regent Elizabeth ordered an army to be marched towards Poland, with Hungary, ruled by Mary's husband Sigismund, also declaring war on the pretender.
In response, Siemowit turned east, towards the fresh convert Jogaila. Masovia and Lithuania were on somewhat tepid and mild terms - the Masovian Piasts and the Gediminids were connected by numerous marriage ties, and yet often clashed for border territories. Despite some hostilities in the past, Siemowit hoped to obtain Lithuania's support in this war, with territorial offers to come with it... On March 21st of 1383, Siemowit IV of Mazovia sent a letter to Nikolai I Jogaila of Lithuania, which we can discuss in slightly bigger detail. In the very first line, the Polish lord refers to Jogaila as "elder brother", despite not even being in the same dynasty. Lithuanian nationalists in the modern era, both referring to future events and to the fact that in many places in Eastern Europe such a referral implies suzerainity, often point to this letter as a fact that Mazovia, and by extension Poland, were dominated by Lithuanian influence at the time. However, serious researchers dismiss the claim, accurately pointing out that it was Siemowit's way to appeal to Jogaila and gain his support - the power of the Grand Duke could be a deciding factor in the war, after all. Most of the text of the letter is composed of a well-crafted plead for help, with an important chapter being the paragraph right before the signature. There, Siemowit promises the return of Podolia, all the territory Poland acquired during the Lithuanian Civil War there, with even a chunk of Polish Podolia to settle the deal. And, most importantly, should he acquire the throne of Poland, he will join Jogaila in an attack against the Teutonic Knights - "after all, both of our nations have been punished by it". As a sign of good will, immediately with the letter Mazovia returned the city of Podlasie and it's surroundings, which it had acquired shortly after Jogaila's ascension.
Lithuania had a few interests of it's own in Poland. The most important one was, of course, the border territories of Podolia and Volhynia. Both of these regions were wealthy, profiteering from being a crossroad between Northeast Europe and Constantinople, and thus, by extension, the Middle East and North Africa. Lithuania and Poland fought numerous wars for these territories, with no decisive outcome. Hungary also laid some claims in the area. In addition, the opportunity of an alliance, however temporary it may be, against the Teutonic Order, finally obtaining a chance to end the hundred years' war for survival against the Knights proved to be enticing as well... The hope of breaking up Poland-Hungary and thus securing the Grand Duchy's western frontier played a part, too, and about a month later, Jogaila wrote back to Siemowit, stating that he accepts the call to arms.
The Lithuanians immediately began preparing an army for a summer march into Poland. While this was taking place, though, the Polish Civil War was going back and forth. Siemowit began sieging Kalisz as his first major act of the war, but the news of an incoming Hungarian and Lesser Polish army led to him cancelling the siege and retreating back to his territory east. Piast supporters and Angevin supporters, from small barons with an army of a few hundred men to powerful magnates and entire dukes clashed - according to Polish chroniclers, the war was very bloody, both among the soldiers and the peasantry who had to take the effects of the war. In July, Jogaila's forces joined up with Mazovian and Greater Polish troops in Plock, and thus the scales of the war were tipped heavily in the pretender's favor. In August of 1383, Siemowit captured Lęczyca and Kalisz, and finally engaged Lesser Polish troops near Adamki, close to Sieradz. The
Battle of Adamki took only a few hours, leading to the loyalists taking heavy losses and retreating due to the superior numbers of the Masovian-Lithuanian forces. Even though it was a major victory that basically guaranteed Siemowit control over Greater Poland, it did not lead to victory, far from it.
On September of 1383, Hungarian troops, led by Sigismund of Luxemburg personally, devastated Mazovia, even threatening to march north, towards Lithuania proper. Reacting to this development, Jogaila demanded Siemowit to abandon his habit of sieging down one castle after another and instead march east to engage the enemies directly. Siemowit agreed, with hopes that a decisive victory against Elizabeth and Sigismund would lead to them giving up the war. Winter was coming, too, and news arrived that Teutonic forces raided and pillaged Sudovia while the Grand Duke was away. Weeks ticked. After looting and sacking the outskirts of Plock, Polish-Hungarian forces surprisingly started moving south, back to Hungary, instead of attacking Lithuania and forcing Jogaila out of the war. While it appeared as if the incoming Masovian and Lithuanian troops scared them off, the reasons for this action weren't even rooted in the Civil War. Back in Hungary, the Dowager Queen Elizabeth could barely hold onto her rule, especially because of the conflict between her and Sigismund, who was backed by the Holy Roman Emperor, Wenceslaus IV. Elizabeth was not enthusiastic with her daughter having to rule the country along with her husband, while Sigismund wanted to invade Hungary and depose the queen consort to become the kingdom's co-ruler. Charles III of Naples, the only surviving male Angevin, was a much more preferred heir by the Hungarian nobility, too, and the King planned an invasion of his own to claim the throne. John of Palisna also raised his banners in revolt, opposed to the centralization policy of the previous monarch Louis I. Faced with such a complicated situation and trying to avoid an invasion of the nation when she was embroiled in a whole other war, Elizabeth had no other choice but to pull out of Poland and secure Hungary first - or at least knock Siemowit out of the war with a preemptive attack and find a solution, but this did not happen due to the latter's alliance with Lithuania.
In late October of 1383, Elizabeth finally decided on her course of action, and the Duke of Mazovia received an offer to marry Hedwig, the younger daughter of the deceased Louis I, despite her betrothal to William of Habsburg, and thus become King of Poland. Siemowit was quick to agree. Elizabeth retracted the betrothal, and Hedwig arrived to Krakow in the beginning of 1384. The last Lesser Polish opposition was defeated in numerous skirmishes across the country, Mary and Sigismund were retracted from their position as rulers of Poland and Siemowit Piast was crowned
Siemowit I of Poland. The Piast dynasty returned to the throne of their nation once again, at least for the time being. Siemowit I and Nikolai I of Poland and Lithuania respectively began planning their collective attack on the Teutonic Order, each one with their own territorial goals in mind...
What did this year-long foreign civil war mean for Poland? Quite a lot, actually. Despite mainly being a second-tier player, Lithuania showed it's teeth as a Christian nation, and displayed it's capabilities to affect the wars and diplomatic struggles in it's neighboring countries. Had Jogaila not helped Mazovia in the war, the personal union between Poland and Hungary would have likely been restored.
This is not even say of the importance that the outcome of the war will have on the not so distant future.
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Wow, this turned out longer than expected. I was planning to write about an entire decade in this part, but there is just so much detail to add for all of this to even make sense.