 The parish church , St Martin 's , has been dated to the mid @-@ 13th century . An earlier church is believed to have been built during the Norman period , as a stone was found within the grounds with markings from that time . The name St. Martin is believed to have been given to the church by the monks of the Bec Abbey , after Martin of Tours , a saint in Normandy . Before 1245 , references to the church only name it as " Ruislip church " . 
