Definition of "lastborn"

It took me back across the dim gulf of ages to some happy home in dead Imperial Kôr, where this winsome lady girt about with beauty had lived and died, and dying taken her last-born with her to the tomb.

1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887