GEOFFREY WAS THE GOVERNOR OF NORMANDY IN THE ABSENCE OF WILLIAM THE CONQUEROR [KING WILLIAM I OF ENGLAND] FROM FRANCE. HE WAS ALSO THE FATHER OF PRIOR SERIO [SERLO] DE PERCY, CHAPLAIN TO KING WILLIAM AND LATER PRIOR OF WHTBY. GEOFFREY IS ALSO THE FATHER OF BARON WILLIAM DE PERCY WHO RECEIVED VAST POSSESSIONS AND HIGH HONORS FROM KING WILLIAM FOR HIS PART IN THE NORMAN CONQUEST OF ENGLAND GEOFF'S THIRD SON PICOT DE PERCY MARRIED AGNES DE SAINT QUINTIN.