The context of my question stems from tryin to determine the exact year the word "slut" was used in the following context:
"Why is thy lord so slutish" - is found in The Canon's Yeoman's Tale. From what I understand it was a tale about alchemists. Per Wikipedia - Chaucer may have written about real life subjects given he supervised repairs of the Kings Chapel, Windsor in 1390. A chaplain named William de Brumley confessed to making counterfeit gold coins in 1374, who was taught by William Shurchirch - a canon at the very same Chapel. If Chaucer was inspired by Shurchirch to write the Canon's Yeoman's tales it leads me to believe it was written during or after 1390.