The eldest legitimate son of Uesugi Tomooki of Ōgigayatsu, following his father's death in 1537, though he was still a child, Tomosada led an attack on the Later Hōjō clan in the Tachibana district of Musashi province.
The eldest legitimate son of Uesugi Tomooki, Ōgigayatsu, after his father's death in 1537, even though he was still a child, led an attack on the Later Hōjō clan in the Tachibana district of Musashi province.