The Semnoni (German: Semnonen) or Semnones were a Germanic tribe which was settled between the Elbe and the Oder in the 1st century when they were described by Tacitus in Germania:

The Semnones give themselves out to be the most ancient and renowned branch of the Suevi. Their antiquity is strongly attested by their religion. At a stated period, all the tribes of the same race assemble by their representatives in a grove consecrated by the auguries of their forefathers, and by immemorial associations of terror. Here, having publicly slaughtered a human victim, they celebrate the horrible beginning of their barbarous rite. Reverence also in other ways is paid to the grove. No one enters it except bound with a chain, as an inferior acknowledging the might of the local divinity. If he chance to fall, it is not lawful for him to be lifted up, or to rise to his feet; he must crawl out along the ground. All this superstition implies the belief that from this spot the nation took its origin, that here dwells the supreme and all-ruling deity, to whom all else is subject and obedient. The fortunate lot of the Semnones strengthens this belief; a hundred cantons are in their occupation, and the vastness of their community makes them regard themselves as the head of the Suevic race.

In the 3rd century, the Semnoni shifted southwards and eventually ended up as part of the Alamanni people. The Augsburg stela, a Roman monument of the 3rd century states that the Semnones were also called Juthungi.

The orange area shows one view of the extent of the Suebian tribes in 50 AD

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