Sem-Yeto's capital city, seat of government, was a populous rancheria in what is now Suisun valley, though the tribes of his dominion were scattered over the great plain from Sonoma eastward to the Sacramento.Vallejo suggested for the convert the name of the Mission, so he was christened Francisco Solano. The comandante found the new churchman quite useful and quite faithful to the white settlers. "Solano was a king among the Indians," writes Vallejo in his annals. "All the tribes of Solano, Napa and Sonoma valleys were under tribute to him," and through this the comandante was enabled to keep peace in his great territory, covering much of what is now Napa, Solano and Yolo.
Mariano Guadalupe Vallejo