Proper noun
Mandatory Palestine
(historical) A geopolitical entity under British administration, originally consisting of what is now Israel, Judea, Samaria, (the West Bank), and Jordan, which existed from 1920 to 1948.
Synonym: British Mandate
The site also found Heidelberger's 1942 naturalisation record from British Mandatory Palestine and his gravestone alongside his wife Emma in northern Israel. Source: Internet