Guelphs and Ghibellines
The Guelphs and Ghibellines were factions supporting,
respectively, the Papacy and the Holy Roman Empire in central and
northern Italy during the 12th and 13th centuries. The struggle for
power between the Papacy and the Holy Roman Empire had arisen with
the Investiture Conflict of the 11th century.
....the question asks about the "white Guelph" party. The Whites
were opposed to Papal influence, specifically the influence of Pope
Boniface VIIII. Dante Alighieri was among the supporters of the
White Guelphs, and in 1302 was exiled when the Black Guelphs took
control of Florence.