The design followed White's standard pattern for smaller steel cruisers, being of protected type (with an internal curved steel armour deck protecting the machinery spaces) and featuring low freeboard amidships with raised bulwarks connecting the forecastle and poop for weatherliness. It drew heavily from the slightly earlier Medea, but with enlarged dimensions and a revised armament which, for the first time in Royal Navy 2nd-class cruisers, included the new 4.7-inch quick-firing gun. Six of these were carried; three on each side of the main deck. Two 6-inch guns were carried on the centreline, one at either end of the ship upon the forecastle and the poop.
Ten ships of the class were sheathed and coppered for tropical service. These were; Aeolus, Brilliant, Indefatigable, Intrepid, Iphigenia, Pique, Rainbow, Retribution, Sirius and Spartan. The sheathing added 200 tons to each ship's displacement and reduced their speed by a quarter of a knot.
Critical opinion of the design was that it was an improvement on the Medea, but still rather small. In practice they proved to be wet ships and poor seaboats, the low deck amidships being a factor.
Twenty-one ships of this class were ordered under the 1889 Naval Defence Act, making up half of the Act's required forty-two cruisers. The obvious limitations of the Apollos led to a further enlarged & improved design (the) being drawn up by White, of which eight units were also ordered under the Naval Defence Act.
Ships of this class served during the Boer War.
Sybille was wrecked 16th January 1901.
Latona, Apollo, Intrepid, Iphigenia, Andromache, Naiad and Thetis were converted into minelaying cruisers around 1907.
In 1910 Rainbow was transferred to the Royal Canadian Navy.In the same year, Indefatigable was renamed Melpomene to make her original name available for a new battle-cruiser.
After nearly two decades of service, the ships were becoming worn out and units of the class were being progressively sold off in the early 1910s; Melampus in 1910,Pique, Retribution and Tribune in 1911, Melpomene in 1913, and Aeolus, Scylla & Terpsichore in 1914.The remainder found a reprieve with the outbreak of the First World War.
By the last year of the First World War, the surviving ships were no longer of any fighting value, and six of this class were converted into blockships to be scuttled in the entrances to enemy-occupied ports in Belgium. The cruisers Intrepid, Iphigenia and Thetis were expended on 23 April 1918 in the raid on Zeebrugge; Brilliant and Sirius were unsuccessfully expended in the similar raid on Ostend. A further attempt to block Ostend took place in May, with Sappho and (the latter being of the) as blockships, but Sappho broke down en route to Ostend and returned to port.
Spartan was renamed Defiance in 1921.
The surviving members of the class were for disposal after the war, mostly being sold between 1920 and 1922, with only Defiance being retained (as part of the torpedo school at Devonport) until finally sold in 1931.
| Name | Builder | Laid down | Launched | Completed | Fate | Notes | |
|---|---|---|---|---|---|---|---|
| Chatham Dockyard | 29 April 1889 | 14 August 1890 | December 1891 | Broken up in 1920 | Andromache-type minelayer | ||
| Chatham Dockyard | 27 May 1889 | 10 February 1891 | April 1892 | Broken up in 1920 | Andromache-type minelayer | ||
| Vickers, Barrow-in-Furness | 22 August 1889 | 22 May 1890 | April 1891 | Sold in 1920 | Andromache-type minelayer | ||
| Vickers, Barrow-in-Furness | 30 August 1889 | 2 August 1890 | December 1891 | Broken up in 1910 | |||
| Vickers, Barrow-in-Furness | 3 October 1889 | 29 November 1890 | January 1892 | Broken up in 1922 | Andromache-type minelayer | ||
| Samuda Brothers, Poplar | 29 October 1889 | 9 May 1891 | February 1893 | Broken up in 1921 | |||
| Samuda Brothers, Poplar | 29 October 1889 | 17 October 1891 | April 1893 | Broken up in 1914 | |||
| Robert Stephenson, Hebburn | 11 October 1889 | 27 December 1890 | May 1894 | Wrecked in 1901 | |||
| J & G Thomson, Clydebank | 27 August 1889 | 30 October 1890 | April 1892 | Broken up in 1914 | |||
| J & G Thomson, Clydebank | 29 October 1889 | 13 December 1890 | April 1892 | Expended as blockship in 1918 | Andromache-type minelayer | ||
| J & G Thomson, Clydebank | 11 December 1889 | 24 February 1891 | May 1892 | Broken up in 1911 | |||
| Devonport Dockyard | 19 March 1890 | 13 November 1891 | June 1893 | Broken up in 1914 | |||
| Sheerness Dockyard | 24 March 1890 | 24 June 1891 | April 1893 | Expended as blockship in 1918 | |||
| London & Glasgow | 6 September 1889 | 12 March 1891 | April 1892 | Broken up in 1913 | |||
| London & Glasgow | 6 September 1889 | 20 June 1891 | November 1892 | Expended as blockship in 1918 | Intrepid-type minelayer | ||
| London & Glasgow | 17 March 1890 | 19 November 1891 | May 1893 | Expended as blockship in 1918 | Intrepid-type minelayer | ||
| Palmers, Jarrow | 30 October 1889 | 13 December 1890 | March 1893 | Broken up in 1911 | |||
| Palmers, Jarrow | 30 December 1889 | 25 March 1891 | January 1893 | 1910 to Royal Canadian Navy as . Sold in 1920 | |||
| Palmers, Jarrow | 31 January 1890 | 6 August 1891 | May 1893 | Broken up in 1911 | |||
| Armstrong Mitchell, Elswick | 7 October 1889 | 27 October 1890 | April 1892 | Expended as blockship in 1918 | |||
| Armstrong Mitchell, Elswick | 16 December 1889 | 25 February 1891 | July 1892 | Broken up in 1931 | |||
| Sources: Conway's 1860–1905, p.77; Jane's, p.62; Cocker, p.26-27. | |||||||