Ada of Holland

Ada of Holland (c. 1163–1205) was the daughter of Floris III, Count of Holland and his wife Ada of Huntingdon. In 1176 she married Otto I of Brandenburg, becoming Margravine of Brandenburg until his death in 1184. Their son Albert II succeeded his half-brother Otto II as Margrave of Brandenburg in 1205. She is an ancestor of George I of Great Britain and thus of all British monarchs since 1714.