BBC: Henry I (1069 - 1135): The youngest and ablest of William I the Conqueror's sons, Henry strengthened the crown's executive powers and modernised royal administration.
Charter of Liberties of Henry I, 1100: Charter granted by Henry that served as the model for the Magna Carta in 1215.
Henry I: Short biography for the king of England (1100–1135), youngest son of William I.
Henry I, Beauclerc (1100-1135 AD): Biographical article about the king nicknamed "Beauclerc" (fine scholar) for his above average education.
The Normans: Henry I: A brief summary of the life of Henry I.
Wikipedia - Henry I of England: Article about the life and reign of the English king.