In early modern usage, jealousy covered a greater variety of affective conditions than what is understood under that emotion today. But in practice, jealousy primarily referred to anxiety or distrust in matters of love, then as now.
1. Theory
In Latin and the emerging European vernaculars, expressions to do with jealousy referred, first, to dissatisfaction in love, which is also its stereotypical context nowadays; but it also referred to feelings one would now describe as envy a…