The first recorded name of the castle is "castrum de Coningsberg in Zambia". The Polish chronicler Jan Długosz, writing in the 15th century referred to the city's battle standard captured by the Poles at the Battle of Grunwald (1410) by both the German name "Kunigsperk" and the Polish version "Crolowgrod", which given the Polish orthography of the time, has been transliterated as "Krolowgrod". "Król" is the Polish word for king and "gród" is similar to the German ending "berg". "Krolowgrod" by the 16th century became the standard Polish name "Królewiec".