The following is the entry for George Nathaniel Broke in William O'Byrnes 1849 'Naval Biographical Dictionary'.
BROKE. (Captain, 1845.)George Nathaniel Broke, born 26 April, 1812, is brother of the present Sir Philip Broke, Bart., Capt. R.N.
This officer entered the Navy 16 Aug. 1825; passed his examination in 1831; obtained his first commission 29 June, 1833; and was subsequently appointed – 8 Dec. in the same year, to the Belvidera 42, Capt. Chas. Burrough Strong, in North America and the West Indies – and, 21 Oct. 1837, as First-Lieutenant, to the Wasp brig 16, Capts. Hon. Dudley Worsley Anderson Pelham and Geo. Pelham. For his services, under the latter officer, throughout the campaign in Syria, from its commencement until the fall of St. Jean d’Acre, he was advanced to the rank of Commander, 4 Nov. 1840. He commissioned the Thunderbolt for service at the Cape of Good Hope, 28 Nov. 1842; and on 18 Dec. 1845, was awarded the rank of Captain. He is at present on half-pay. Agents – Case and Loudonsack.