#OTD in 1915.
P. G. Wodehouse's story "Extricating Young Gussie" is published in The Saturday Evening Post (U.S.). It introduces as characters Jeeves and Bertie.
It was published in the United Kingdom in the January 1916 edition of The Strand Magazine. It was included in the collection The Man with Two Left Feet (1917).
https://en.wikipedia.org/wiki/Extricating_Young_Gussie
Extricating Young Gussie at PG:
https://www.gutenberg.org/ebooks/7471