The maritime spice trade monopoly in the Indian Ocean and the Arabian Sea stayed with the Arabs during the High and Late Middle Ages. However, the dominance of Middle East traders was challenged in the European Age of Discovery. After Vasco Da Gama's arrival in Kappad Kozhikode in 1498, the Portuguese began to dominate eastern shipping, and the spice-trade in particular. They established a trading center at Tangasseri in Quilon during 1502 as per the invitation of the then Queen of Quilon to start spices trade from there. The Zamorin of Kozhikode permitted the new visitors to trade with his subjects such that Portuguese trade in Kozhikode prospered with the establishment of a factory and a fort. However, Portuguese attacks on Arab properties in his jurisdiction provoked the Zamorin and led to conflicts between them.