Sabellian

Sabellian can refer to Sabellian (christology), a believer in Sabellianism which is the nontrinitarian belief that the Father, Son and Holy Spirit are different modes or aspects of one God, rather than three distinct persons in God Himself
Sabellian, another name for the Osco-Umbrian languages
Sabellian (people) a collective ethnonym for a group of Italic peoples or tribes inhabiting central Italy at the time of the rise of Rome