Chikamasa was the son of Ikoma Chikashige, a native of Owari province. He served Toyotomi Hideyoshi and saw service in the latter's Chugoku Campaign (1577-[[1582|82). He went on to serve in the Battle of Shizugatake (1583)and the Komaki Campaign (1584). Chikamasa also attended the siege of Odawara Castle (1590) and led some 5,000 men in the 1st Korean Campaign (1592-[[1593|93). Over his career, Chikamasa saw his income increase from 20,000-koku to 60,000 when he was given Takamatsu in Sanuki province in 1587.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005