When pounds, shillings and pence (£sd) were to be replaced by decimal currency on 14 February 1966, many names for the new currency were suggested. In 1963, the then-Prime Minister of Australia, Robert Menzies, a monarchist, wished to name the currency the royal. Other proposed names from a public naming competition included more exotic suggestions such as the austral, the oz, the boomer, the roo, the kanga, the emu, the koala, the digger, the zac, the kwid, the dinkum, and the ming (Menzies' nickname). Menzies' influence resulted in the selection of the royal, and trial designs were prepared and printed by the Reserve Bank of Australia. Australian treasurer and future Prime Minister, Harold Holt, announced the decision in Parliament on 5 June 1963. The royal would be subdivided into 100 cents, but the existing names shilling, florin and crown would be retained for the 10-cent, 20-cent and 50-cent coins respectively. The name royal for the currency proved very unpopular, with Holt and his wife even receiving death threats. On 24 July Holt told the Cabinet the decision had been a "terrible mistake" and it would need to be revisited. On 18 September Holt advised Parliament that the name was to be the dollar, of 100 cents.