The Spaniards were the first non-natives to visit Davao, led by Alvaro de Saavedra in 1528. In 1847, after the Spanish troops revolted and killed the Muslim leader, Datu Bago, Don Jose Oyanguren became the first governor and renamed the place Guipozcoa. In 1900, the Japanese established extensive plantations of abaca around the gulf area and engaged in logging, fishing, and trading. The increase of Japanese in the area earned Davao the nickname "Japan Kuo" or "Little Japan." Finally, in March 16, 1937, President Elpidio Quirino formally inaugurated the signing of Davao as a charter city.