 He was still Legate in Hungary

He reconciled King Ladislaus the Posthumous (1457) with Emperor Frederick III, and in 1458 made peace between the Hungarian nobles in favour of Matthias Corvinus as successor of Ladislaus.He was still in Hungary when Pope Pius II invited the princes of Christian Europe to meet him at Mantua (1459) to confer on the common danger and the need of a general crusade.While Cardinal Bessarion sought in Germany something more than brilliant promises, Carvajal continued his labours in Hungary, which he left only in the autumn of 1461, "grown old and feeble", says Pastor, "in that severe climate, amid the turmoils of the Court and the camp, and the fatigues of travel … [in] that bleak country of moorlands and marshes".