Joan Brent

Marriage to: John Brent Circa 1439 of Somersetshire, England

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Indications are her name was Margaret, not Joan:

Sir John Brent of Cossington, married, first Ida, the daughter of Sir John Beauchamp, of Lilisdon, Knt., by whom he had Sir Robert, who succeeded him in the estates of Cossington; and, second Joan, the daughter of Sir Robert Latimer, Knt.
A son of the second married, Sir John, succeeded to the estate of Cossington (upon the death and exinction of the line of his half-brother, Sir Robert Brent).10
' His son, Sir Robert, married Margaret, the daughter of Hugh Malet, of Currypool.'