This page created 15 July 2014, and last modified: 29 October (Frankfurt fragment image added)
In the western half of the empire, the Exculcatores iuniores Britanniciani is listed as one of auxilia palatina units in the Magister Peditum's infantry roster. Its shield pattern, as shown in various manuscripts under the plain label Exculcatores, is as below:
The pattern shows red rim and a purple main ground (more maroon in P & M and more blue in W, and inexplicably white in O; Ff is too faded to determine the colour), along with a yellow version of the twin-headed zoomorphic motif that is extremely common in the Notitia (over a dozen examples), especially amongst auxilia palatina: the version borne by the Exculcatores iuniores Britanniciani has a fringed neck, and thus looks very similar to those borne by the Celtae seniores, and in the eastern half of the empire, the Falchovarii, under the Magister Militum Praesentalis II. This is one of the few patterns for which O gives a version that is different from W in which P rather follows W and not O (here the main ground colour); interestingly, both the patterns previously illustrated are also like this (the Invicti iuniores Britanniciani and the Batavi iuniores).
In addition to its numerous appearances in the Notitia, the twin-headed zoomorphic motif is known from a range of sources in northern Europe, such as on the ca. 6th century Torslunda bronze die from Sweden shown below:
More directly connected with the Roman army is the example depicted on the Arch of Constantine in Rome, completed ca. 315, on a shield carried by a soldier shown participating in the siege of Verona in 312:
A winged Victory stands above the boss, while below, we see two horned creatures, possibly goats, facing each other, and with their necks curving in towards each other (and interpreted by Michael P. Spiedel in "Ancient Germanic Warriors: Warrior styles from Trajan's Column to Icelandic sagas", Routledge, 2004, as dragons).
Although there is evidence that many labels attached to the shield patterns illustrating the western auxilia platina have been shifted from their proper place, it is not clear that this has happened to this unit; it may well be labelled with the correct shield pattern.
The name Exculcatores means "those who tread down", and is described in Vegetius' military manual (2.15), roughly contemporary with the Notitia, in these terms: Post hos erant ferentarii et levis armatura, quos nunc exculcatores et armaturas dicimus..., i.e. "Following (the first line) were the ferentarii and [other] light infantry, whom we now call exculcatores and armaturas..."; their main function may have been to pursue a beaten foe.
Britanniciani naturally mean "British", and in the Notitia is used synonymously with Britones, e.g. the Invicti iuniores Britanniciani, a.k.a. the Invicti iuniores Britones. While the name raises the possibility the Exculcatores iuniores Britanniciani was raised in Britain, it is also at least as possible the unit had just just stationed there in the relatively recent past, in which case it could be any of a number of auxiliary units known to have been previously stationed in Britain, and simply renamed.
However, it should be noted that the Exculcatores iuniores Britanniciani, although listed in the Magister Peditum's infantry roster, is apparently not assigned to any of the field commands. This could because the unit has for some reason been omitted or deleted (e.g. because it had been destroyed), or simply missed due to a careless mistake, but it may also be because the unit is actually assigned, but under a somewhat different name. In particular, there is a Victores iuniores Britanniciani assigned to the the Comes Britanniarum, but no correspondingly named unit in the Magister Peditum's list, which would make a very good fit (Seeck linked the Victores iuniores Britanniciani with the Victores iuniores, a unit of auxilia palatina assigned to the Comes Hispenias, which would seems to raise even more problems than it solves).
Another possibility, although to my mind less good, is the Britones listed on the Magister Equitum's Gallic command, although this, from its positioning, would appear to better suit the equally unassigned "other" Batavi iuniores: see the discussion there for more details.
Two other units bear the name Exculcatores in the Notitia: the Exculcatores seniores and the Exculcatores iuniores. Both are listed in the Magister Peditum's infantry roster as auxilia palatina units, rather highly ranked at that, but like the Exculcatores iuniores Britanniciani, they are not assigned to any field command. Unlike the Exculcatores iuniores Britanniciani, their shield patterns are not recorded.
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