 He also had a long-standing feud with his cousin, Sokollu Mehmed Pasha.He commanded the Ottoman land forces during the conquest of previously Venetian Cyprus in 1570/71, and in the campaign against Georgia and Persia in 1578.During the campaign on Cyprus, Lala Mustafa Pasha, who was known for his cruelty towards vanquished opponents, ordered the Venetian commander of Famagusta Marco Antonio Bragadin flayed alive and other Venetian military officers killed in sight or executed, even though he had promised safe passage upon surrendering the city to the Turkish army.