By Phillip SEARS (pianist)
Charles-Augustin Collin (1865-1938) came from a musical family: his father, Charles-René Collin, was organist at St-Brieuc Cathedral from 1845 to 1909, and Charles-Augustin himself was organist of Rennes Cathedral from 1884-1935 - so between them, father and son held titulaire posts at major Breton cathedrals for 90 unbroken years!  Charles-Augustin studied at the École Niedermeyer in Paris, where he worked with Gigout and Franck.  You can read more about him here: https://is.gd/Irrf0u .  This piano piece is dedicated to the Breton writer Louis Tiercelin (1849-1915), who had been a major figure in the Breton cultural renaissance of the early 20th century, and was also an associate of Guy Ropartz.  The piece is headed by an extract from his patriotic poem 'Brittany is Poetry':
"O Bretagne, je suis ton fils reconnaissant !
C’est a toi que j’ai du de garder en mon ame
La foi dans I’Idéal que partout je proclame,
Legs divin qu’on recoit des aieux en naissant."
Which roughly translates as:
"O Brittany, I am your grateful son!
It's up to you that I had to keep in my soul
Faith in the ideal that everywhere I proclaim,
Divine deeds that are received from the air when they are born."
The piece is marked to be played in the style of an old Breton folk tune. Although written for piano, I can easily imagine it played on the organ.  My thumbnail shows a detail from a photo of the pipes of the magnificent Cavaillé-Coll organ at Rennes Cathedral, which Collin played for so many years.