The Malacca Sultanate ended in 1511, when it fell to the
Portuguese.
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Singapore was apart of Malacca Malay Sultanate so the arrival of
Islam to Singapore is almost identical to Malacca.
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The Malacca Sultanate was taken over by Portugal in the early
1500s, so there is currently no chief minister. There were several
throughout its history, including the last minister, Paduka Tuan,
who served from 1510-1511.