The power balance in Kerala changed as Eralnadu rulers developed the port at Calicut. The Zamorin became one of the most powerful chiefs in Kerala.[1] In some of his military campaigns – such as that into Valluvanadu – the ruler received unambiguous assistance from the Muslim Middle Eastern sailors.[2] It seems that the Muslim judge of Calicut offered all help in "money and material" to the Zamorin to strike at Thirunavaya.[5]