Přemysl Otakar II was a significant king of the Czech lands who ruled from 1253 to 1278. He was known for his military prowess and ambition, expanding his territory to include parts of Austria and Germany. His reign is often referred to as a golden age for the Czech kingdom, marked by economic growth and the establishment of Prague as a key city. Otakar II was also a patron of culture and the arts, promoting the development of Gothic architecture in his realm. His rule ended with his defeat at the Battle of Marchfeld in 1278, which led to a decline in his power and influence.