sentences:  The earliest detailed references to Portsmouth can be found in the Southwick Cartularies.However, the Oxford Dictionary of British Place Names gives the Anglo-Saxon name "Portesmūða" as late as the 9th century, meaning "mouth [of the harbour called] Portus" (from Latin).In Anglo-Saxon times a folk etymology "[harbour] mouth belonging to a man called Port" arose, which caused a statement in the "Anglo-Saxon Chronicle" that in 501 AD ""Port and his 2 sons, Bieda and Mægla, came with 2 ships to Britain at the place which is called Portsmouth"".