Florence experienced a long period of civic revival beginning in the 10th century and was governed from 1115 by an autonomous medieval commune. But the period of revival was interrupted when the city was plunged into internal strife by the 13th-century struggle between the Ghibellines, supporters of the German emperor, and the pro-Papal Guelphs after the murder of nobleman Buondelmonte del Buondelmonti for reneging on his agreement to marry one of the daughters of the Amidei family. In 1257, the city was ruled by a "podestà", the Guelph Luca Grimaldi. The Guelphs had triumphed and soon split in turn into feuding "White" and "Black" factions led respectively by Vieri de' Cerchi and Corso Donati. These struggles eventually led to the exile of the White Guelphs, one of whom was the poet Dante Alighieri. This factional strife was later recorded by Dino Compagni, a White Guelph, in his "Chronicles of Florence".