Motoshige was at first a vassal of the Jinbo of Etchû, then joined Uesugi Kenshin sometime after 1560. He held Toyama castle and battled with Etchû Ikko-Ikki in 1572. He later sided with the Oda but lost Toyama to them nonetheless.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005