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. - http://www.bbc.co.uk/history/historic_figures/matilda_queen.shtml
Wikipedia - Empress Matilda - Brief article on the daughter and dispossessed heir of King Henry I of England and his wife Maud of Scotland. - http://en.wikipedia.org/wiki/Empress_Maud
Empress Matilda (1101-1169) - Brief biography provided by Royal Berkshire History. - http://www.berkshirehistory.com/bios/matilda.html
Matilda - Brief biography for the queen of England, daughter of Henry I. - http://www.factmonster.com/ce6/people/A0832213.html