BBC: Matilda, Royal princess and Empress (1102 - 1167): Matilda was wife of the Holy Roman Emperor Henry V and afterward claimant to the English throne in the reign of King Stephen.
Empress Matilda (1101-1169): Brief biography provided by Royal Berkshire History.
Matilda: Brief biography for the queen of England, daughter of Henry I.
Wikipedia - Empress Matilda: Brief article on the daughter and dispossessed heir of King Henry I of England and his wife Maud of Scotland.