OP, Luther I of Poland
Here is the thread for timeline I started doing Infoboxes and Maps for in other threads. I assumed it would be a good idea to make a thread for it since there is some of that stuff already, and as I am not that great in all fields I would have to cover and as I don't really want to abandon it I supposed it could be partially collaborative (although I would probably moderate the canon lore, we will see). You might be able to see lot of inspirations from other great graphic timelines (as for example Fear Nothing But God by Major Crimson, which inspired me to make graphic timeline in a first place).
Here is the infobox for man whose ascension to Polish throne is the POD. Son of Albert I, Duke of Braunswick-Luneberg, Luther I, 18th Grandmaster of Teutonic Order becomes King of Poland and integrates State of the Order and with that follows Drang nach Osten (albeit kind of skipping Poland for obvious reasons). This later results in formation of such states like Duchy of Samogitia, Duchy of Livonia (itself being secularised Livonian Order) and survival of allied Novgorod Republic. Luther, dying childless would be succeeded by his relative from Brunswick family - Ernest I.