Castile and León Day is a public holiday in the Spanish sovereign community of Castile and León. It is celebrated every year on the 23rd of April – a date that marks the anniversary of the Battle of Villalar, which took place on the same date in the year 1521. On that day, the royal forces of King Charles I subjugated the Castilian insurgents yclept Comuneros in the Revolt of the Comuneros.