 The Portuguese were permitted to build a fort on the island, today known as Kastella, construction of which began in 1522, but relations between the Ternateans and Portuguese were strained from the start.An outpost far from Europe generally only attracted the most desperate and avaricious, such that the generally poor behaviour of the Portuguese, combined with feeble attempts at Christianisation, strained relations with Ternate's Muslim ruler.In 1535 Sultan Tabariji was deposed and sent to Goa by the Portuguese.