Before IDs, full government records, or efficient communication, how did the ancient Romans prove their identity?

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Chapters:
0:00 The Three False Neros
1:36 The stakes of establishing identity
3:10 Kamikoto
4:24 Birth certificates and census records
5:40 Military records
6:33 Proving identity
7:28 Petronia Iusta
8:01 Archias
8:35 Titus Flavius Longus
8:58 Civis Romanus sum