Spencer was posted to New Zealand to work under the missionary Thomas Chapman at the recently formed Te Ngae branch of the Church of England Mission.
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Arnold Lawrence was born at 2 Polstead Road, Oxford, on 2 May 1900, the youngest of five sons born to Thomas Chapman (who became, in 1914, Sir Thomas Chapman, 7th Baronet), an Anglo-Irish nobleman from County Westmeath, and Sarah Junner (1861–1959).
The feature is named after Thomas Chapman, English trunk-maker of Southwark who in 1795 discovered a method of processing fur seal skins for use in the hat trade, thus initiating the industry in London.