Thermos (/ˈθɜːrmɒs/; also known as Thermon /ˈθɜːrmən/ or Thermum; Greek: Θέρμος) was an ancient Greek sanctuary, which served as the regular meeting place of the Aetolian League. Its focal point was the temple of Apollo Thermios, famous for the archaic terracotta metopes decorated with painted scenes from mythology, which are among the earliest examples of this art form in Greece.