Imerius (Himerius, Imier, Immer) of Immertal (d. ca. 620 AD) was a monk, hermit, and missionary in the SwissJura. The name of the town of Saint-Imier refers to him.
Imerius was born in Lugnez, a small village in the Canton of Jura about 570. He spent some time in Lausanne and made a voyage to Palestine. After he had returned he lived in the valley of Saint-Imier as a hermit. The legend says that Bishop Marius of Lausanne gave him the piece of land at Saint-Imier as a present, but this legend is historical very uncertain. In the 9th century, a monastery was built over his tomb.