# Theseion

> English word · Proper noun

## Definitions
1. Synonym of Hephaestaeum (“the Temple of Hephaestus in Athens”).

## Etymology
So called under the mistaken assumption that it housed the remains of the Athenian hero Theseus.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/theseion