Old Mortality is one of the Waverley novels by Walter Scott. Set in south west Scotland, it forms, along with The Black Dwarf, the 1st series of his Tales of My Landlord (1816). The novel deals with the period of the Covenanters, featuring their victory at Loudoun Hill (also known as the Battle of Drumclog) and their defeat at Bothwell Bridge, both in June 1679; a final section is set in 1689 at the time of the royalist defeat at Killiecrankie.Scott's original title was The Tale of Old Mortality, but this is generally shortened in most references. (This summary is from Wikipedia.)
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.