Mungo's mother Teneu was a princess, the daughter of King Lleuddun (Latin: Leudonus) who ruled a territory around what is now Lothian in Scotland, perhaps the kingdom of Gododdin in the Old North. She became pregnant after being raped by Owain mab Urien according to the British Library manuscript. However, other historic accounts claim Owain and Teneu (also known as Thaney) had a love affair whilst he was still married to his wife Penarwen and that her father, King Lot, separated the pair after she became pregnant. Later, allegedly, after Penarwen died, Tenue/Thaney returned to King Owain and the pair were able to marry before King Owain met his death battling Bernicia in 597 AD.