| Costelloe | T | | | Depot
Source: Medal rolls | Royal Munster Fusiliers |
| Costelloe | W | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costelloe | William | 42328 | Trooper | No known Company. Served in 34th Btn IY
Source: QSA Medal Rolls | Imperial Yeomanry |
| Costells | J | | | Received the Mediterranean Medal
3rd Battalion
Source: Medal roll WO100 368 | (Prince of Wales's Own) West Yorkshire Regiment |
| Costells | J | | | 6th Battalion
Source: QSA and KSA medal rolls | Royal Warwickshire Regiment |
| Costells | J | | | 6th MI
Source: Medal rolls | Bedfordshire Regiment |
| Costells | J | | | 2nd Battalion
Source: QSA and KSA medal rolls | Bedfordshire Regiment |
| Costells | J H | | | 1st Battalion
Source: QSA and KSA medal rolls | Manchester Regiment |
| Costells | John | | | Source: WO100/280 | Cala Town Guard |
| Costells | P | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costells | P | | | 2nd Battalion
Source: QSA and KSA medal rolls | (King's Own) Royal Lancaster Regiment |
| Costelow | Sydney Ernest | 35845 | Private | Source: QSA Medal Rolls | 110th Company, 2nd Btn, IY |
| Costen | J | | | 6th MI
Source: Medal rolls | Bedfordshire Regiment |
| Coster | Dr Hermanus Jocob | | | Born in Holland. He was State Attorney of SAR and ex officio JP He prosecuted on behalf of the State in the case of the Reformers. There were originally four indictments against the whole of the prisoners, but negotiations between Dr Coster and Advocate Wcsscls (the latter representing the accused) resulted as follows: that the leaders, Colonel Rhodes and Messrs. L Phillips, Hays Hammond, and Geo. Farrar, should plead guilty to count 1 (conspiring with Dr Jameson to make a hostile invasion), and that the rank and file of the committee should plead guilty to counts 3 (distributing arms, guns, erecting defences, etc.) and 4 (arrogating the functions of Government in Johannesburg, arming their own Police Corps, etc.); that counts 2, 3 and 4 should be withdrawn against the latter. Dr Coster admitted that the effect of this would be making the charge against the rank and file purcly nominal, while in the case of the four leaders he undertook not to press for exemplary punishment. Nevertheless, at the trial Dr Coster, in a violent speech, depicted in the blackest terms the action of those men, and claimed that the Court should apply the Roman Dutch Law in preference to the statutes of the SAR, and demanded the severest penalty that could be imposed under that law and under the Thirty-three Articles and the Gold Law. Dr Custer resigned the State Attorneyship in consequence of an insulting reference of President Kruger's to his countrymen. He took part in the Boer War, and was killed in action at Elandslaagte. | Boer Forces |
| Coster | E | | | 1st Battalion
Source: QSA and KSA medal rolls | Gloucestershire Regiment |
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