A continuation of the Chronica Jacobi de Aquis names "Thomaso" as the son of "Manfredo" and his wife "Biatrix figlola dil Conte Amedeo di Savoya". "Mainfredus III marchio Salutiarum" appointed "Beatricem de Sabaudia suam uxorem" as co-tutor of "Thomæ et Alasinæ filiorum suorum" in his testament dated 1244.
He succeeded his father in 1244 as TOMMASO I Marchese di Saluzzo. The men of "marchionatus Salutiarum" swore homage to "Mainfredi marchionis, Thomæ…filio" by charter dated 1244. The testament of "Bonefacius Montisferrati marchio", dated 12 Jun 1253, appoints "Guilelminum filium meum inpuberem" as his heir, substituting in turn "Alaxinam…filia mea" and "Tomam de Saluciis", if his son died childless. "Thomas marchio Salutiarum atque…Aluysia de Ceva eius uxor et Salutiarum marchionissa" donated property to "monasterii beati Marie de Revello" by charter dated 25 Jun 1291.
The testament of "domini Thomæ Marchionis Salutiarum", dated 17 Oct 1294, chooses his burial "in monasterio S. Mariæ de Staffarda" with his heart buried "in monumento dominæ Alasiæ quondam marchionissæ Salutiarum consortis suæ in monasterio S. Mariæ de Revello", bequeathes property to "filium suum Philippum…filium suum Joannem…Bonifacium…Georgium… Elianoram filiam suam…filios dominæ Alasiæ filiæ suæ…filiam suam Beatricem…filiam suam sororem Constantiam…filiam suam sororem Margaritam…filiam suam sororem Alianam…filiam suam Catherinam…filiam suam Alvisiam…filiam suam Jolam…Manfredum suum primogenitum". 1