Moor, son of Nubel Amm. XXIX 5.2.44.

Because of exactions by the Romans in Africa Amm. XXIX 5.2.8, Zos. IV 16.3 he sent protests to the imperial court but without success Amm. XXIX 5.2-3 and led a rebellion of African tribes in Mauretania Amm. XXVIII 6.26, XXIX 5.3, Aur. Vict. Epit. 45.7, Oros, VII 33.5; proclaimed emperor by the equites quartae sagittariorum cohortis and the pedites Constantiani Amm. XXIX 5.20 (one of their tribunes ‘torquem pro diademate capiti inposuit Firmi’); was at one time recognised as far away as Calama in the proconsular province VIII 5338 Calama (dated c. a. 373, see VIII 5347; the name of Firmus should be restored as that of the Augustus honoured); received the purple Zos. IV 16.3. He supported the Donatists Aug. c. Ep. Parm. I 10.16, 11.17, c. Litt. Petil. II 83.184, Ep. 87. The revolt probably began in a. 372/3 and ended in a. 374/5 Amm. XXIX 4-6. Firmus was defeated by Theodosius 3 and committed suicide Amm. XXVIII 6.26, XXIX 5.4-55, XXX 7.10, Oros. VII 33.6, Aur. Vict. Epit. 45.7, Symm. Ep. I 64, X 1, Claud. de bello Gild. I 333, 343, 347.

He was brother of Sammac Amm. XXIX 5.2.13, Gildo Amm. XXIX 5.6, Claud. de bello Gild. I 335-6, 347, Mazuca Amm. XXIX 5.40-1, Mascezel Amm. XXIX 5.11, Claud. de bello Gild. 389, Oros. VII 36.4, Dius Amm. XXIX 5.11 and Cyria Amm. XXIX 5.28; his wife is mentioned but not named Amm. XXIX 5.36.