I like that...
Mind if I create a character or two for myself right now?
Kazimierz II Piast, Polish Catholic, King of Poland
Eldest among many sons of Boleslaw Piast, Duke of Krakow, Kazimierz saw the unification of Poland firsthand, even leading some of the troops into battle.
***Unifications of Poland in my Alternate History***
Poland was first unified under Kazimierz I Piast, son of Miezko, Count of Ciezyn, when Kazimierz I decimated the troops of the invading Kievans at the gates of Krakow, beating back the Rurikoviches and taking the Duchy of Sandomiersk and Mazovia from Kiev. After this victory, he married Konstancja Grakonksz, daughter of Wzebor, Wielkopolska, Count of Kujawy, Poznankie, and Gnieznienkie, and with claims on nearly the whole of Poland north of Krakow. With this, Kazimierz I inherited the whole lands of the Polans in 1005, unifying Poland.
However, with the death of Kazimierz I in 1044, months after Kazimierz II was born, many sons laid claim to the throne of Poland, and, unfortunately, the youngest, Jaroslaw, in a vie for dominance, allied with the Kievan Rus, who then, going through Northern Hungary, attacked Krakow from the south, coordinating with Jaroslaw's supporters, defeating the Royal forces under the command of Boleslaw, heir to the throne of Poland. The Kingdom of Poland was forced to split apart, when the Kievans signed a peace. Titles were divided equally between the sons of Kazimierz I, with the exclusion of the Duchy of Sandomiersk, which was given to Kiev.
The 2nd Unification of Poland occured in 1058, when Boleslaw's son, Kazimierz II, was but 14 years of age, yet already an extremely capable commander. Leading the Unification, his father, Boleslaw, pressed claims against his brothers, Jaroslaw, Zygmunt, Wzebor, and Stanislaw, with his other brothers, Miezko, Lambert, and Wladyslaw supporting his claims and pressing their own. While Zygmunt gave in and wished for peace with his kin, the other three resisted, and brought both the Germans and the Russians into the conflict. The Duke of Brandenburg supported Jaroslaw, Duke of Wielkopolska, and moved troops into Poznan to support him. Stanislaw was supported in Pommerania/Prussia by the Prince of Novgorod. The Kievans for once stayed neutral in a conflict between Poles.
The Battle of Silesia was the first to be fought, as it involved the Royal forces, in a defensive position against the German heavy infantry and the Polish light infantry from the mountains of Lubusz and the plains of Poznan (Jaroslaw). The Royal forces were slightly outnumbered, mainly because Brandenburg's liege, Germany, had sent a sizeable force to aid their vassal. With his great military skill, Boleslaw defeated his brother in the battle, and the Usurper forces retreated across the Oder to Poznan, to set up defenses.
However, Jaroslaw was still at the head of a large army, and, after the defeat of Lambert's forces in Kujawy, at the hands of Stanislaw, the army of Stanislaw was marching south, towards Krakow. Hurriedly, Boleslaw rushed back to Krakow to defend the great city. Jaroslaw chased after him, but his infantry could not catch the swift cavalry of Poland. When Boleslaw reached the city, he found it under siege by Stanislaw and the Russians. The Kievans had come too, thirsty for the plunders of Krakow that were so long denied them.
A mighty charge, lead by Boleslaw and his brothers, Zygmunt, Miezko, Lambert, and Wladyslaw, along with Boleslaw's two eldest sons, Kazimierz II and Miezko the Wise. In this charge, all of the Royal cavalry punched a hole through the line of the Usurpers of the North. However, they punched too deeply. Though Stanislaw's line broke, Jaroslaw came in from behind, and Wzebor galloped out of the south, having taken a route around Krakow and came up behind it, leading a charge of cavalry.
Boleslaw's forces were encircled. He decided to lead a charge, straight through Jaroslaw's heavy German infantry. As he did so, the forces of Stanislaw regrouped and reinforced Jaroslaw. Then, Wzebor's cavalry turned towards the flank of the Royal forces. Turning quickly to the south, Boleslaw lead his final charge into the ranks of the Usurpers, coming into single combat with Wzebor, and killing him. The other two Usurper brothers were killed, as Kazimierz slaughtered many. Boleslaw died on the battlefield that day, as both he and his brother Wzebor were locked in death thrusts, both their swords impaling the other. Many others died that day, and the battles after that were much smaller and cannot follow such a display of grandeur and courage, but, to sum it up, Jaroslaw, Stanislaw, and Wzebor lost their land and were exiled, for turning Poland against itself.
In short, the War for Polish Succession was a success for Boleslaw, but, with his death at the Battle of Krakow, it seemed all was lost. However, Kazimierz II stepped up to claim dominance, as the eldest of Boleslaw's sons and has united the realm, even though it is about to be split up between the brothers. However, Kazimierz will remain the dominant one and shall dole out titles as he wishes, remaining King of Poland. Kazimierz, having watched his uncles and father tear apart the realm in war for nearly 8 years, has gained much experience from it, seeing both the horrors and the uses of war.
***That was a long alternate history to type***
Stats for Kazimierz II Piast:
Martial: 10 (14)
Diplomacy: 4 (5)
Intrigue: 3 (4)
Stewardship: 10 (11)
Health: 7 (6)
Fertility: 6 (6)
Traits: Knowledged Tactician, Indulgent, Just
Age: 24
Brothers, in order of age: Zygmunt and Roger