Here’s a lovely word for a writer of historical romance. By way of example, Merriam-Webster quotes from Sir Walter Scott’s Waverly: “The very footmen sometimes grinned too broadly, the maidservants giggled mayhap too loud . . .”
Waverly was published in 1814, which would clearly make it acceptable for me to use “mayhap” in one of my Regency-era books. I haven’t so far, though now, as I’m writing the third book in the Penhallow Dynasty series, it occurs to me that there’s a character who could very well utter it. Stay tuned . . .