Alexander the Great isn't poisoned
“Eternal Glory: A Story of The Alexandrian Empire” was written by JP_Morgan. It starts with the assumption that Alexander had, in fact, been poisoned by Cassander, but here, Alexander is told what is going to go down, and arrests the conspirators. After going ahead with the planned conquest of Arabia, he helps Craterus put down a revolt in Greece, and arrests Antipater shortly thereafter; Antipater is promptly executed.
After this Alexander tries to sit tight, but a revolt in Parthia convinces him to move the capital closer to Parthia, in Tyre. To calm down the pro-Greek outrage from this, he goes on to conquer Carthage and Rome in the period 318-317 BC. The general Perdiccas, known to be ambitious, is sent to Nubia, where he is tied down in guerrilla warfare and eventually killed.
The Indian Campaign
Alexander engages in a few minor campaigns in the Asia Minor area, before eventually getting bored, and launching an invasion of India in 311 BC. But Chandragupta, the ruler of India, anticipates this, and launches a counter-invasion of Bactria. Alexander then pulls back, and the two fight an epic battle for the ages, with Alexander being outnumbered by about three to one. Eventually, Alexander is forced to retreat after being saved from capture by a Persian officer named Chosroes.
He signs a treaty recognizing the secession of his eastern provinces, including Bactria.
The Second Indian Campaign
Alexander, though, could not sit tight forever. After his son, the future Alexander IV, proves himself by taking Gaul from 304-302 BC, Alexander the elder eventually invades India again in 301 BC. After getting some southern Indian kingdoms to ally with him, he attacks Chandragupta. However, both Alexander and Chandragupta die during this campaign and Alexander is succeeded by his son. Alexander IV's harsh treatment of the natives eventually leads to his near-expulsion from India. The only reason more of his Indian conquests aren't lost is because Alexander is called back to Pella to be coroneted, thus stopping him from driving the “allied” kingdoms further from him.
The Phillipian Civil War
Alexander had to put down a revolt in Greece in 295 BC, before confronting his brother Philip. His brother had been upset at the treatment of the Indians. One day, Alexander discovers Philip is plotting against him, and attempts to have him arrested. Philip flees, and ends up leading the whole western part of the empire in revolt from 288 to 281 BC.
Such colorful characters as Pyrreus and Chosroes end up joining Philip in a vicious fight for Italia. Eventually, Alexander wins, forcing Philip to flee to Pretannike (Britain).
The Third Indian Campaign
Not long after this, Alexander launches another invasion of India. Due to a number of factors, including local non-Indian commanders seizing the initiative, and getting an ally from the area of Katanga (which had only vaguely heard of his atrocities in central India), Alexander is able to overthrow the Mauryan rulers.
He then seizes southern India, conquers Katanga after the new rajah Vanhara attempts to seize territory, and attempts to reoccupy Anhara, where he is killed. His son Argaeus succeeds him as Argaeus III after converting to Buddhism, sickened by the carnage that had taken place.
Argaeus the Peaceful's Reign
Argaeus's reign is marked among the most peaceful that the Alexandrian Empire would see. Though Philip invades Gaul by 275 BC, Argaeus gets him to agree to a truce. Unfortunately, Philip is murdered by an assassin working for Italian landowners, who remember what havoc Philip had wrought throughout their country less than ten years before.
Philip's children form a kind of paramilitary society known as the True Sons of Alexander that would cause much trouble later on, especially as a modern criminal organization similar to the Chinese Triads, claiming descent from a “noble” secret society.
The End of the Empire
Argaeus dies in 236 BC, and under his son Perdiccas the empire begins to fall apart. Perdiccas' reign is marked by the heavy persecution of Buddhists, the loss of most of India, and the punishment of generals for their failures. He died without an heir, because he was homosexual.
Under succeeding kings, the empire continued to fall apart due to rebellious family members, areas already asserting semi-autonomy, and incompetent officers. Finally the last Aragaead ruler that claimed to be legitimate, Philip IV, ruling Phonecia and Judea, was deposed by some ambitious Phonecians.
The Present World
An epilogue segment written by JP_Morgan (in a hurry), shows a surviving Argaead ruler living in Turka, and the TSA apparently giving nuclear weapons to a major enemy. There are barely any Buddhists in China, although a few powerful Buddhist states exist outside China. The epilogue ends (suspensefully) with the city of Chorasmia being destroyed by a nuclear weapon. JP_Morgan has stated that any further attempts to explain what happened have been put off for now, and he has no clue if he'll have the time to do a story or timeline based on this concept again.
The timeline can be read in its entirety here.