On the way to Marathon to capture the Bull, Theseus sought shelter from a storm in a shack owned by an ancient lady named Hecale.
Translation of Plutarch's text:"Theseus, wishing to be actively employed, and at the same time to win the favour of the people, went out against the Marathonian bull, which was causing no small annoyance to the inhabitants of the Tetrapolis, and he overcame the bull and drove it through the city to exhibitit, after which he sacrificed it to Apollo Delphinius.
For the demes round about used to meet and hold a Hecalesian festival in honour of Zeus Hecalus, and honoured Hecale, whom they called by the pet name Hecaline, because when she entertained Theseus, who at the time was quite young, she addressed him as an old woman would and greeted him with that sort of pet names.
When Theseus was setting out to the contest she vowed in his behalf to offer a sacrifice to Zeus if he came back safe.
"[1]One of today's Athens northern suburbs, Ekáli, an affluent and very exclusive residential community on the western foot of Mount Penteli, is called by that name.