Marcabru is one of the earliest troubadours whose poems are known. There is no certain information about him; the two vidas attached to his poems tell different stories, and both are evidently built on hints in the poems; not on independent information.
According to the brief life in BnF ms. 12473, Marcabrun was from Gascony (details of the dialect of his poems support this) and was the son of a poor woman named Marcabrunela. This evidently comes from a reading of poem 293,18.
According to the longer biography in MS. Vat.