'Laeti', the Latin plural of 'Laetus', derived from Germanic languages, designates members of certain
barbarian tribes which had agreements with the
Roman empire providing for their livelihood - removing the main motive for plundering or uncontrollable attempt of invasion - and a number of soldiers recruiting from their ranks as auxiliary units to help keep their less friendly 'brothers' away.
Military use
From the
Notitia Dignitatum we know that around 400, in the Western empire, the following nations (''gentiles'' 'people' is a generic term, also used for analogous
Sarmates in Italian provinces) had supplied units, which were garrisoned in places (followed by the province in the genitive) in the Gallic prefecture, each commanded by a ''Praefectus laetorum'' (prefect), under the overall command -along many regular units- of the
Magister militum for the ''praesentales pediti'' (imperial infantry):
★
Batavi and
Suevi:
Baiocas and
Constantia, Lugdunensis II
★
Suevi:
Ceromannos and another, unknown location in Lugdunensis III
★
Francs:
Redonas, Lugdunensis III
★
Teutoniciani:
Carnunta, Lugdunensis IV
★
Suevi:
Arumbernos, Aquitanica I
★
Taifals:
Poitiers, Aquitanica
★
Lingonenses: dispersed over Belgica I
★
Acti:
Epuso, Belgica I
★
Nervii:
Fanomantis, Belgica II
★
Batavi of
Nemetacum, Belgica II
★
Batavi Contraginnenses:
Noviomagus, Belgica II
★ unspecified ''gentiles'':
Remo and
Silvamectum, Belgica II
★
Lagenses: near the
Tungri, Germania II
Sources and references
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Notitia dignitatum
★
Pauly-Wissowa (not yet exploited)