Under the reign of Emperor Charles IV in the second half of the 14th century, the Bohemian Kingdom became the center of the Holy Roman Empire, with Prague as its capital, ushering in the kingdom's golden era. Under his enlightened and largely peaceful reign, royal investment into Czech institutions, culture, education, and infrastructure received royal patronage. Among some of those gifted with Charles IV's personal and financial support (many of which today bear the emperor's name) were Prague's Charles Bridge, Charles University, its New Town, St. Vitus Cathedral, Karlštejn Castle, and the foundation of the city of Karlovy Vary. Bohemia's golden era came to an end with Charles' death in 1378. (Czech Republic Wikitravel)