Belgian prince served as cadet on British warship according to the Weekly Intelligence Summary No. 3 dated 22 January 1921

Bellerophon-class

An item reported that the Belgian king (1) arrived on 22 January at Portsmouth, England where he visited his son (2) serving as a cadet on board of the British HMS Temeraire. The king went the next day back to Belgium.

Notes

1. Albert Léopold Clément Marie Meinrad, Albert I of Belgium (8 April 1875 Brussels, Belgium-17 February 1934 Namur, Belgium), reign 23 December 1909-17 Februray 1934

2. Charles Théodore Henri Antoine Meinrad (10 October 1903 Brussels, Belgium-1 June 1983 Raversijde, Belgium) proceeded to the Royal Naval College, Osborne, England, in 1917 to Dartmouth, England and promoted to sub-lieutenant in the British Royal Navy in 1926.

3. Building ordered on 30 October 1906, laid down by HM Dockyard Devonport on 1 January 1907, launched on 24 August 1907, completed in May 1909, commissioned on 15 May 1909, decommissioned in 1921 and sold to be broken up on 7 December 1921. Of the Bellerophon-class battleships, preceded by HMS Dreadnought and succeeded by St. Vincent-class.

Source

The National Archives, Kew Gardens, England CAB-24-118-88