The William Light reference article from the English Wikipedia on 24-Apr-2004
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William Light

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Colonel William Light (1786 - 1839) was born in Malaya in 1786, a son of Captain Francis Light, the Governor of Penang, and Martina Rozells, the so-called "Princess of Kedah" of mixed Siamese-Portuguese descent.

In 1835, Light was appointed Surveyor-General to the new colony of South Australia, where he laid out the street plan of the city of Adelaide which persists to this day.