II. Ulászló, known as Ulászló after his baptism (Jogaila in Lithuanian, Jagiełło in Polish), played an important role in the history of Lithuania and Poland during his lifetime. II. Ulaszló was born in Vilnius around 1352 or 1362. In 1377, he inherited the Grand Duchy of Lithuania from his father, which he shared with his uncle, Kęstutis. In 1386, he married the twelve-year-old Polish queen, Hedwig, and after being baptized, II. He became the co-ruler of Poland under the name Ulászló. In 1399, Hedwig died and Jagiellon united Poland and Lithuania in a personal union, establishing the alliance of the two countries that lasted for several centuries. In 1410, the Polish-Lithuanian alliance won a decisive victory over the Teutonic Knights in the Battle of Grünwald. earned its place among the great powers of the time. II. Ulászló founded the Jagiellonian dynasty, which, in addition to the Polish and Lithuanian crowns, sometimes also owned the Czech and Hungarian crowns. The Jagiellonian dynasty became one of the most important royal houses in Central and Eastern Europe. During the time of Jagielló and his successors, the Polish-Lithuanian union was the the largest Christian state in the world. II. Ulaszló's life and reign contributed a lot to the history of the region, and his memory lives on even today.

II. Ulászló (Jagelló) Lithuanian prince and Polish king ruled from 1377 to 1434. During this time, he also brought about significant changes in coinage. In 1386, after the union with the Polish kingdom, he introduced the Polish coinage system in Lithuania. Lithuanian denars were then minted until 1430, but their weight and gold content were the same as Polish denars. In Poland, Ulászló reformed the coinage. In 1386, he introduced the solid gold zloty, worth 30 denars. The zloty remained the official currency of Poland in the following centuries. During the reign of Ulaszló, foreign masters played an increasingly important role in the Polish coinage. In 1392, German masters arrived at the Kassa mint, who combined local coinage traditions with German techniques. Ulaszló's coinage significantly contributed to the development of the financial system in Poland. The introduction of the zloty stabilized money and contributed to the development of trade. And foreign masters brought new techniques to Poland, which improved the quality of coinage. The most important types of Ulaszló's coinage were the gold zloty, ducat, half ducat, the silver denar, halfdenar, obolet and the bronze bracteate. The zloty and the ducat were the most important types of coinage during Ulaszló's reign. . The zloty formed the basis of the financial system in Poland, and the ducat was a valuable coin used in international trade. The denar was the most common currency in Poland even during the reign of Ulászló. However, its weight and gold content changed over time. The bracteate began to spread in Poland during the reign of Ulászló. It was a thin, light coin, usually struck in bronze.