"Sir Arthur Hunter Palmer KCMG (28 December 1819 - 20 March 1898) was an Australian politician who served as the fifth Premier of Queensland, in office from 1870 to 1874." ... "Palmer was born on 28 December 1819 in Armagh, Ireland."
Second independent secondary source for 28 December 1819, agreeing with the ADB and with the tree's death date.
"In 1866, Palmer was elected to Parliament as member for Port Curtis in the Legislative Assembly of Queensland." Infobox: "constituency_AM1 = Port Curtis | assembly1 = Queensland Legislative | term_start1 = 19 March 1866 | term_end1 = 14 November 1878 | predecessor1 = John Douglas | successor1 = Albert Norton"
Exact dates from the Wikipedia infobox, which matches Wikidata P39 (member of the Queensland Legislative Assembly, 19 March 1866 - 14 November 1878). ADB: "In 1866 Palmer was elected for Port Curtis to the Legislative Assembly and as expected aligned himself with the squatter party."
Infobox: "constituency_AM2 = North Brisbane | assembly2 = Queensland Legislative | term_start2 = 15 November 1878 | term_end2 = 24 December 1881 | predecessor2 = New seat | successor2 = William Brookes | alongside2 = Samuel Griffith"
Matches Wikidata P39 (member of the Queensland Legislative Assembly, 15 November 1878 - 24 December 1881). ADB: "In 1878 he retired as leader of the Opposition in favour of McIlwraith and was elected for North Brisbane" and "In December he resigned from the assembly and was called to the Legislative Council."
"Palmer was awarded a KCMG in 1881." ADB: "Palmer was appointed K.C.M.G." and, under Awards, "Knight Commander of the Order of St Michael and St George"
Wikipedia and ADB agree on the honour and the year; Wikidata P166 = Q12177415 (Knight Commander of the Order of St Michael and St George).
"On 24 December 1881 he became President of the Queensland Legislative Council, a position that he retained until his death." Infobox: "office3 = Member of the Queensland Legislative Council | term_start3 = 24 December 1881 | term_end3 = 20 March 1898"
Matches Wikidata P39 (member of the Queensland Legislative Council, 24 December 1881 - 20 March 1898). ADB: "In December he resigned from the assembly and was called to the Legislative Council."
"Palmer served as Administrator (deputy to the Governor) from 2 May 1883 to 6 November 1883, from 20 April 1886 to 12 December 1886, from 9 October 1888 to 1 May 1889, and from 16 November 1890 to 6 May 1891."
Wikipedia lists four administratorships; the ADB entry names only those of 1883 and 1888-89.
"Palmer served as Administrator (deputy to the Governor) from 2 May 1883 to 6 November 1883, from 20 April 1886 to 12 December 1886, from 9 October 1888 to 1 May 1889, and from 16 November 1890 to 6 May 1891."
Wikipedia lists four administratorships; the ADB entry names only those of 1883 and 1888-89.
Infobox: "death_place = Toowong, Brisbane, Queensland | resting_place = Toowong Cemetery". ADB: "he died on 20 March 1898 at his home, Easton Gray, Toowong, Brisbane. He left an estate of 23,900 pounds."
Burial place from the Wikipedia infobox, corroborated by Wikidata P119 = Q7824339 (Toowong Cemetery). No place row exists for Toowong Cemetery itself, so the event is placed at Toowong.