Continual Light more than Light, too.
I read about very poor peasant farmers who had to work for wealthier peasants, because they had less than an acre or two and so could not support their families with the plots they had... before we talk about taxes, labor requirements, and so forth. So I'm thinking Plant Growth (or subtler spells that make the soil richer) would be popular.
Spells that control smells. Imaging working in the leather industry in those days. Also spells that make jobs safer; the death rate for miners was probably very high.
The above and charm person. Especially handy for merchants hawking their wares.
I've always assumed that a society in which actual, honest to goodness mind control was present, would have all kinds of rules and laws about using said mind control on people, with incredibly grave consequences.