Question: What was Thoas's grandfather punished for?
Sentence (from "Thoas (Tauri king)"): Rhadamanthus, Ariadne's uncle, bequeathed Thoas the island of Lemnos, over which he reigned until his daughter Hypsipyle, unable to kill her own father to avenge the offenses against the Lemnian women, tied him secretly in an oarless boat and sent him adrift into the Aegean Sea.
Relevant evidence: No