Ida of Lorraine was an 11th-century French aristocrat and blessed figure known for her religious devotion. Born in the Ardennes around 1040 to Godfrey III, Duke of Lower Lorraine, she married Eustace II, Count of Boulogne, in 1049. She was the mother of notable figures, including Godfrey of Bouillon and Baldwin, who both ruled the Kingdom of Jerusalem. Following the death of her husband, she utilized her significant wealth to support charitable works and establish multiple religious houses, maintaining a notable correspondence with Anselm of Canterbury.