[1] Alleyne is known to have studied medicine at the University of Edinburgh but he left there for New South Wales, arriving in April 1839.
He seems to have taken part in a cattle farming venture with a cousin but this failed and after he was declared insolvent in 1844 he then left Australia.
He was originally headed for the Marquesas but changed his mind and disembarked in New Zealand where he took up a military commission and fought in the Hone Heke War.
In 1852 it was noted that Alleyne had used chloroform at the Sydney Infirmary in a successful amputation of the left leg of a girl with "strumous disease".
[2] He had links to the Sydney suburb of Willoughby as in 1858 he bought five portions of land with a combined area of 103 acres (42 ha) on the Little Sugar Loaf Peninsula, now known as Castle Cove.