Great Commonwealth

This is my take on altering the course of history. It's mainly focused on Europe and making the Jagiellon dynasty survive.

Catalysts
-Sigismund I the Old's and Bona Sforza's second son, Wojciech I Olbracht doesn't die the same day he was born.

-Louis II Jagiellon doesn't die during the battle of Mohács.

The House of Jagiellon comes to power
It's the fifteenth century. Wojciech Olbracht is born on the 20th September 1527. In 1548 his father Sigismund I the Old dies and his brother Sigismund II August is elected as the King of Poland and Great Duke of Lithuania. At that time, Wojciech was not happy of this outcome and proposed his brother that he should receive a province of his own. Sigismund wasn't sure about this idea, but an idea popped up in his head. He was married to Barbara Radziwiłł, but a few years ago he was pursuing to marry Mary I of England. Negotiations regarding her and Wojciech's marriage have started, and Mary, visibly attracted to the Jagiellon, agreed to marry him. Both of them also shared the same conservative and fierce view on Catholicism. The couple married on 1st July 1552, infuriating the Habsburg family. This event marked the beginning of the Tudor-Jagiellon dynasty in Great Britain and strengthened the Catholic beliefs on the islands.

In the meantime, the Battle of  Mohács takes place on the 29 August 1526. What historians now call a miracle, the weather was surprisingly bad, a thunderstorm was raging. The Ottoman powers considered it a bad sign, but still went to battle. Before the battle, Louis II was told by some of his underlings that the army he is trying to use in the battle uses obsolete methods, they proposed him some modern maneuvers. A crucial point in the reconstruction of the army was the king's meeting with Stephen VII  Báthory, who decided to use the Tatar's own movement as a weapon against them. The united Christian army was due to escape from the battle field as soon as it would start, then it would split up and come from behind. As the battle unfolded, lightning bolts were hitting everywhere, crippling both sides terribly. As Louis II was escaping, a bolt hit a few Turks who were chasing him, leading to his survival. The battle ultimately ends up undecided, because both sides ran off the battle field.

Louis II's survival led to him changing his mindset and, fearing he might end up the same way as his great uncle Ladislaus III. To prevent that, he immediately started negotiations with the Ottomans, not minding the disapproval of other Christian monarchs, he even proposed Hungary to become a fief of the Ottoman Empire, as long as it would keep a bit of independence and the wars would stop. This act was approved by his uncle Sigismund I, known for his peaceful nature. The Sultan decided to finally go along and in return wanted Croatia and a few other southern Hungarian lands. Disappointed and abandoned by the nobility, Louis II agreed, which was sealed by the Treaty of Szeged in 1527. Legend says that when the king was coming back to the capital, he said to Stephen VII "Do not worry. I'm too weak to do this, but my posterity shall help yours defeat the Sultan, even maybe behead him. My wife is pregnant!"

Ladislaus IV the Great
Louis II was right. Mary of Austria was indeed pregnant and gave birth to their first child and only son, Ladislaus IV on the 8th December 1528. The future king did not have an easy childhood. Surrounded by Germans who came to Buda together with his mother, he was often laughed upon because of his "funny accent". Mary wasn't a good mother either, she showed signs of demency and madness, often threatening the young Ladislaus and possibly even was disloyal to Louis II. Now called "the Beaten", the king started suffering from severe depression, abused alcohol and started writing poetry, earning him another nickname, "the Lost Artist". His poems were very nihilistic and depressive.

TBC.