2. Son of Andromenes the Stymphaean, and one of Alexander's officers, was accused with his brothers, Amyntas and Simmias, of having been engaged in the conspiracy of Philotas, B. C. 330, but was acquitted, together with his brothers. [AMYNTAS, No. 4.] In B. C. 328, Attalus was left with Polysperchon and other officers in Bactria with part of the troops, while the king himself marched against the Sogdians. (Arrian, 4.16.) He accompanied Alexander in his expedition into India, and was employed in several important duties. (Arrian, 4.27, 5.12.) In Alexander's last illness, B. C. 323, he was one of the seven chief officers who passed the night in the temple of Serapis at Babylon, in order to learn from the god whether Alexander should be carried into the temple. (Arrian, 7.26.)
After the death of Alexander, Attalus joined Perdiecas, whose sister, Atalante, he had married. He accompanied his brother-in-law in his unfortunate campaign against Egypt in B. C. 321, and had the command of the fleet. After the murder of Perdiccas, all his friends were condemned to death by the army; Atalante, who was in the camp, was immediately executed, but Attalus escaped his, wife's fate in consequence of his absence with the fleet at Pelusium. He forthwith sailed to Tyre, where the treasures of Perdiccas had been deposited. These, which amounted to as much as 800 talents, were surrendered to him by Archelaus,