The island was discovered by the British Australian New Zealand Antarctic Research Expedition (BANZARE), led by Douglas Mawson, 1929–1931, and so named, following the reading of a proclamation on its summit on 13 January 1930 claiming the area for the British Crown. A cairn and plaque erected by Mawson at the time to commemorate the event has been designated a Historic Site or Monument (HSM 3) following a proposal by Australia to the Antarctic Treaty Consultative Meeting.
- "Proclamation Island". Geographic Names Information System, U.S. Geological Survey. Retrieved 2013-10-24.
- "List of Historic Sites and Monuments approved by the ATCM (2012)". Antarctic Treaty Secretariat. 2012. Retrieved 2013-10-24.
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