Noun
allowance for a monarch's personal expenses
Source: WordNetGregg, pp. 322–324 In January 1711, Anne forced Sarah to resign her court offices, and Abigail took over as Keeper of the Privy Purse. Source: Internet
Madden, F. (ed.) (1831) The Privy Purse Expenses of the Princess Mary, quoted in Loades, p. 111 Her expenses included fine clothes and gambling at cards, one of her favourite pastimes. Source: Internet