Saint Limnus was martyred during the persecution in the reign of Decius (249-251), along with Sts Pionius and Macedonia, Sabina, and Asclepiades. They suffered at Smyrna, a mercantile city on the eastern shores of the Aegean Sea.
St Limnus was a priest of the Church of Smyrna, and his wife St Macedonia was from the village of Karine. They had been cast into prison for confessing Christ. That is where St Pionius and his companions met them.
The Life of St Pionius does not record the details of the martyrdom of Sts Limnus or Macedonia.