WIKIPEDIA:

“ Jeremiah Clarke (c. 1673 – 1 December 1707) was an English baroque composer and organist.
Thought to have been born in London around 1674, Clarke was a pupil of John Blow at St Paul's Cathedral. He later became organist at the Chapel Royal. After his death, he was succeeded in that post by William Croft.
Clarke is best remembered for a popular keyboard piece: the Prince of Denmark's March, which is commonly called the Trumpet Voluntary, written circa. 1700. From c. 1878 until the 1940s the work was attributed to Henry Purcell, and was published as Trumpet Voluntary by Henry Purcell in William Sparkes's Short Pieces for the Organ, Book VII, No. 1 (London, Ashdown and Parry). This version came to the attention of Sir Henry J. Wood, who made two orchestral transcriptions of it, both of which were recorded. The recordings further cemented the erroneous notion that the original piece was by Purcell. Clarke's piece is a popular choice for wedding music, and has featured in royal weddings.
The famous Trumpet Tune in D (also incorrectly attributed to Purcell), was taken from the semi-opera The Island Princess which was a joint musical production of Clarke and Daniel [......] ”

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