Gascon poet-musician and the earliest exponent of the trobar clus, an allusive and deliberately obscure poetic style in Provençal.

Unlike most successful troubadours (troubadour), Marcabru was not of the aristocracy, and he served in several courts throughout southern France and Spain without finding a permanent patron. Marcabru's innovative technique and humour are evident in all his verse, and he was widely imitated and admired, despite his consciously obscure imagery and difficult symbolism. More than 40 of his poems are extant, including Crusade songs, satires, romances, and a witty pastourelle. Marcabru's favourite subject, however, was the contrast of fin' amors (pure, perfect love) and amars (the sensual courtly love praised by his contemporaries). A vehement moralist, Marcabru criticized the nobility and other troubadours for distorting the true courtly virtues. Many of his finest poems are in direct response to works by other poets, including William IX, duke of Aquitaine, regarded as the first troubadour poet.