The descendants of Edward III's third and fourth sons, John of Gaunt and Edmund of Langley, respectively formed its cadet houses of Lancaster and York.
The origins of the modern parliament can be traced to the rule of this royal house, during which the Model Parliament was formed. Its first ruler held the throne concurrently with his second son for thirteen years; that son was married to Margaret, daughter of Louis VII of France, at age five so his father could reacquire the Norman Vexin. It originated with the marriage of (*) Geoffrey, Count of Anjou, to Matilda, the daughter of Henry I. The descendants of Edward III's third and fourth sons, John of Gaunt and Edmund of Langley, respectively formed its cadet houses of Lancaster and York. For 10 points, name this English royal house begun by Henry II that also included Edward I and Richard I.
The origins of the modern parliament can be traced to the rule of this royal house, during which the Model Parliament was formed.
House of {Plantagenet} [or {First Angevin} Dynasty or {First} House of {Anjou}