Sonata III for Organ op.65 1844

Had Mendelssohn managed to deliver the early sketches of the opening section of this Sonata to his sister for use at her wedding; and if this music had then received Royal patronage, we may now have had two Wedding Marches by this master! Details in the video and a timeline below:

1829
April 10
Felix travels to Gt. Britain by ship
August?
Fanny writes to FBM requesting Chorale & Prelude for her wedding
July/August
Felix tours Scotland and Wales
August
Returns to England and injures his knee in a carriage accident
August 11
Felix writes to Fanny annoyed that as yet he had no idea of the date of the wedding
September 2
Wedding date decided
September 28
Fanny writes her own Wedding piece – Prelude in F major
October 3
Wedding – Felix unable to attend due to injuries
Nov/Dec
Felix returns to Germany end of November

Fifteen years later...

1844
On Felix's 8th visit to England, he was commissioned by Coventry & Hollier to write ‘three voluntaries’ for organ.
July 24
On vacation in Bad Soden with Cécile and family, composing and relaxing
July 25
Felix writes to his sister Fanny from Bad Soden asking for the organ piece
in A major ‘that l composed for your wedding’ (written in Wales)
August 9
Date on ms. of first movement of Sonata III
August 15
Felix writes again asking Fanny to make a further search for the piece
August 17
Date on ms. of second movement of Sonata III completed in Bad Soden near Frankfurt am Main. Felix’s health begins to fail
1845
Commission completed in Frankfurt; became Six Sonatas
September - Published in Germany by Brietkopf & Härtel
October - Published in England by Coventry & Hollier
1847
Both Felix and Fanny sadly die within 6 months of each other.