In 1219, the castle was taken over by Danish crusaders - led by Valdemar II. According to a popular Danish legend, the very first flag of Denmark (Dannebrog) fell from the sky during a critical stage of the battle (known as the Battle of Lyndanisse). This first proper castle was referred to as the "Castle of the Danes", in latin Castrum Danorum and in Estonian Taanilinnus. From the latter, the modern name of the city of Tallinn is possibly dervied (see Modern name of Tallinn).