Kurtoğlu Muslihiddin Reis was the father of Kurtoğlu Hızır Reis, the Admiral-in-Chief of the Ottoman Indian Ocean Fleet who commanded the Ottoman naval expedition to Sumatra in Indonesia (1568–1569) in order to protect it from Portuguese aggression. The Ottoman fleet arrived to the Aceh province in 1569, whose ruler, Sultan Alaaddin, had earlier declared allegiance to the Ottoman Empire in 1565. This event marked the easternmost Ottoman territorial expansion.