After this he served at Nadi (Vanua Levu), Bua and Cakaudrove where he pioneered the work before any white missionaries were established there.
The son of Isaac Driver and Adi Asenaca Mairara, Siwatibau was born on 4 November 1940 in Tukavesi Village in Buca Bay, Cakaudrove Province, but grew up in Buca, the village of his mother, who was of chiefly rank.
It is located in the north east of the country, covering the provinces of Bua, Macuata and Cakaudrove on the northern island Vanua Levu, as well as the Lau Islands.
This lasted only until 1867, when the Confederacy was split into two units, the Kingdom of Bau (ruled by Cakobau) and the Confederation of Lau (consisting of the present-day provinces of Cakaudrove, Bua, and Lau).