| Navy | The Royal Navy |
| Type | MS Trawler |
| Class | [No specific class] |
| Pennant | |
| Built by | Cook, Welton & Gemmill (Beverley, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 6 Dec 1915 |
| Commissioned | Apr 1940 |
| Lost | 1 Sep 1940 |
| History | Completed on 11 August 1916. HMS Royalo (T/Lt. Irvine Willox Watt, RNR) was mined and sunk off Penzance, Cornwall, England on 1 September 1940. |
Commands listed for HMS Royalo
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | T/Lt. Irvine Willox Watt, RNR | ??? | 1 Sep 1940 (+) |
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