"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. The chief seems to have been an amiable aborigine and early fell in love with the mission fare and faith. After the padre had baptized him into the bosom of the church, 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. As Solano fell into the ways of the palefaces—became more civilized—he lost much of the saintly character received at his mission christening, and frequently Vallejo would have to take his red friend in hand. But a night in the guard house away from the wine-cup would prepare the chief for the headache and repentance of the morrow."