When Noor ad-Din Ibrahim bin Maulana Israïl had established in Cheribon not only his religion but also his political power, he began, under the name and title of Sunan Gunoong Jati, to propagate the faith by force of arms in the whole of West Java. First he cast his eyes on Bantam, then a mighty realm, the possession or at least the control of which, leaving spiritual motives alone, would materially benefit Moslim trade by securing a free passage through the Straits of Soonda whenever trouble with the Portuguese made the Straits of Malacca unsafe. The Sivaïte Prince of Bantam, trying to preserve his independence by fostering the commercial rivalry between his Muhammadan and Christian friends, received the latter with open arms and besought their assistance against Cheribon and Demak, but Maulana Hasan ad-Din, a son of Sunan Gunoong Jati, defeated him none the less and introduced the Islām among his people both in Bantam proper and in the Lampongs. Another son of Sunan Gunoong Jati founded the Muhammadan principality of Soonda Kalapa, notwithstanding the fortifications erected there by the Portuguese, at the instance of their Bantamese ally, to stem the tide of Muhammadan conquest. After subjugating the vassal state, Maulana Hasan ad-Din attacked, about 1526, the troops of Pajajaran under the King’s son Sili Wangi, and routed them, taking the capital and proselytising by the sword wherever he went, following the example set by Raden Patah of Demak in East Java. It is probable that Bantam, once islāmised and consequently turning against the Portuguese, took the side of Cheribon in these wars. At any rate, we find Bantam and Cheribon together acknowledging the suzerainty of Demak, like the more eastern principalities of the north coast, and when that central Muhammadan state of Java lost the hegemony in consequence of its breaking up after the death of Pangeran Tranggana, and at last the Sooltan of Pajang,[15] into which it dissolved, had to humble himself with his allies, the Adipati of Surabaya and the Sunan of Giri, before the Senapati of Mataram, his former regent in that territory, this valiant and clever potentate claimed the lordship over the island. These were the beginnings of a glorious new Mataram, perhaps identical with Mendang Kamulan.