Translation of "Mistress" in German

This explains why mistress characters end up being miserable.
Das erklärt, warum die Figur der Geliebten am Ende unglücklich ist.
GlobalVoices v2018q4

Meanwhile, Gloucester remarried, his second wife being his former mistress, Eleanor Cobham.
Gloucester heiratete seine vormalige Geliebte Eleanor Cobham.
Wikipedia v1.0

She has been referred to as the first official mistress of a French monarch.
Sie war die erste offizielle Mätresse eines französischen Herrschers.
Wikipedia v1.0

Friedrich I presented it to Countess Wartenberg, his mistress.
Friedrich I. überließ es der Gräfin von Wartenberg, seiner Mätresse.
Wikipedia v1.0

Madame de Pompadour was Louis XV's mistress.
Madame de Pompadour war eine Mätresse Ludwigs XV.
Tatoeba v2021-03-10