Marla married Jason Lannister together they had six children, Joanna Lannister and Stafford Lannister are two of the six.
History: According to semi-canon sources, after the death of Alys Stackspear in childbirth, Jason Lannister was quickly married to Marla Prester, who was twice his age, to prevent him from fathering more bastards. She gave birth to Joanna, Stafford, two more sons and two more daughters.
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Westeros Notorious Rulers and Families
FanfictionDuring the history of Westeros many notorious rulers come into power. Maesters have compiled a the histories of all Rulers and their families. Part Two