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HMS Monmouth is a Type 23 Frigate, Pennant Number F235
Built as a type 23 guided-missile frigate under yard No 1041 by Yarrow Shipbuilders, Scotstoun, Scotland for the Royal Navy.
July 1988 Ordered.  01 June 1989 laid down.
23 November 1991 launched under the name HMS MONMOUTH (F235), launching ceremony performed by Lady Eaton. She is the seventh to bear this name in the Royal Navy. One of the Duke class of which 16 were built for the Royal Navy. She is the 7th ship in the Royal Navy that carried this name.
Displacement: 3.500 ton standard, 4.200 tons full load. Dim. 133 x 16.1 x 7.3m. (draught).
Powered: CODLAG with four 2.205 shp Paxman Valenta 12 CM diesel generators powering two GEC electric motors delivering 4.000 shp. and two Rolls-Royce Spey SM1A boost gasturbines, delivering 31.000 shp, twin shafts. Speed 28 knots. Range by a speed of 15 knots, 9.000 miles.
Armament: two quadruple launchers for eight Harpoon SMSs, two GWS 26 VSL for 32 Sea Wolf SAMs, 1BAE 4.5 inch gun., 2 – DS 30B 30mm AA guns. Two twin 12.75 inch torpedo tubes, for Stingray ASW torpedoes. Carried 1 Merlin HM1 helicopter.
Complement 181.
24 September 1993 commissioned. 
She is affectionately known as “The Black Duke”; MONMOUTH is the only ship in the service of the Royal Navy that has her name painted in black and flies a plain black flag in addition to the ensign. This is due to the dissolution of the title and the blacking out of the Coat of Arms of the Duke of Monmouth in 1685 following the Monmouth Rebellion against James II of England. 
June 1995 she visited Wellington in company with RFA BRAMBLELEAF, the first U.K or U.S warships to visit New Zealand since 1985 ANZUS dispute. http://en.wikipedia.org/wiki/ANZUS   
In early 2004 she was assigned to the Atlantic Patrol Task North. 2006 She underwent operational sea training, conducted by Flag Officer Sea Training, in which she spent six weeks fighting off staged attacks by ships and submarines. 
03 December 2007 HMS MONMOUTH returned to her homeport HMNB Devonport, having completed a circumnavigation of the globe, visiting Australia, New Zealand and Hawaii and taking part in a FPDA Exercise. 
2008 Still in service by the Royal Navy. 
Is not given in the Jersey Post info leaflet when she visited Jersey. 
Source: Mostly copied from http://en.wikipedia.org/wiki/HMS_Monmouth_(F235)  The Encyclopadia of Warships. And some other web-sites. 

Jersey 2008

HMS Monmouth – nicknamed the “Black Duke”, the frigate Monmouth arrived at Pitcairn on 28 May 1995 and, with the RFA Brambleleaf stayed for two days. The Monmouth’s helicopter was put to good use ferrying officials. The Island’s Miscellany newspaper reported: “The day dawned grey, overcast and wet.........'they (the visiting dignitaries) were arriving by helicopter from the Monmouth and the "fly by" performed by the pilot was spectacular to say the least".......Nigel, the (ship's) dentist and Ian, his assistant, consulted with almost every person on Pitcairn. They then proceeded to fill, extract and mould for the entire length of their visit”.