Career
Sebastijan was born at Pićan, Istria before 18 January 1632, a son of Nikola Glavinić. Glavinić family fled from Glamoč to Istria due to the Ottoman invasion. He was baptized on 18 January 1632.
Glavinić studied theology and philosophy in Graz, Wien and Trnava.
He was ordained priest on 26 March 1660.