Five ships of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 have borne the name HMS Diadem, after the diadem

Diadem (personal wear)

A diadem is a type of crown, specifically an ornamental headband worn by Eastern monarchs and others as a badge of royalty. The word derives from the Greek "διάδημα" , "band" or "fillet", from "διαδέω" , "I bind round", or "I fasten"....

, a type of crown

Crown (headgear)

A crown is the traditional symbolic form of headgear worn by a monarch or by a deity, for whom the crown traditionally represents power, legitimacy, immortality, righteousness, victory, triumph, resurrection, honour and glory of life after death. In art, the crown may be shown being offered to...

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was a 64-gun third rate ship of the line

Ship of the line

A ship of the line was a type of naval warship constructed from the 17th through the mid-19th century to take part in the naval tactic known as the line of battle, in which two columns of opposing warships would manoeuvre to bring the greatest weight of broadside guns to bear...

 launched in 1782. She became a troopship

Troopship

A troopship is a ship used to carry soldiers, either in peacetime or wartime...

 in 1798 and was broken up in 1832. was a 14-gun sloop

Sloop-of-war

In the 18th and most of the 19th centuries, a sloop-of-war was a warship with a single gun deck that carried up to eighteen guns. As the rating system covered all vessels with 20 guns and above, this meant that the term sloop-of-war actually encompassed all the unrated combat vessels including the...

 purchased in 1801. She was renamed HMS Falcon in 1802 and was sold in 1816. was a wooden screw frigate

Frigate

A frigate is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries.In the 17th century, the term was used for any warship built for speed and maneuverability, the description often used being "frigate-built"...

 launched in 1856 and sold in 1875. was a Diadem class

Diadem class cruiser

The Diadem class cruiser was a class of "First-Class" protected cruiser built for the Royal Navy during the 1890s that served in the First World War...

 protected cruiser

Protected cruiser

The protected cruiser is a type of naval cruiser of the late 19th century, so known because its armoured deck offered protection for vital machine spaces from shrapnel caused by exploding shells above...

, launched in 1896 and sold in 1921. was a Dido-class

Dido class cruiser

The Dido class was a class of sixteen light cruisers built for the Royal Navy. The design was influenced by the Arethusa class light cruisers. The first group of three ships was commissioned in 1940, the second group and third group were commissioned in 1941–1942...

 light cruiser

Light cruiser

A light cruiser is a type of small- or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck...

 launched in 1942. She was sold to the Pakistani Navy in 1956, and renamed Babur in 1957 and Jahangir in 1982. She was removed from service in 1985.