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As for the Roman Military they used a gladius you suggested as their main fighting tool. To back up my answer this site has pictures and summaries of roman weapons etc (None of which seem to resemble a scimitar).
There are two types of these:
The first being the original shorter Gladius Hispaniensis. The second being the more pointier Gladius Pompeianus
The Roman Military was also outfitted with a Spatha which was a much longer sword.
With neither of the swords in the picture resembling a gladius in my opinion the only option could be a spatha. A quote from the above linked site.
The Roman cavalry used a much longer sword, the so called spatha. Towards end of the second century that spatha gradually replaced the short sword also for the infantry. Lengths 75 cms and longer. The shape of the blade is not easy to distinguish from the Germanic swords of the period. With two exceptions: The first century spatha looking like a longer galdius Pompeianus and the later thrid century spatha type Lauriacum-Hromowka: