  Andromeda (M 31) is the nearest giant spiral galaxy to our Milky Way, and
over the past few decades, has been dubbed the most massive member of the Local
Group. I explore the evolution of the measured mass of M 31 over the past ~80
years, reviewing the different observational and modelling techniques that have
developed over time to measure its mass. I discuss the best present-day
constraints of the mass of M 31 and the consistency of different techniques.
