David Sear, Roman Coins and Their Values, Revised 4th Ed. 1988 has this to say about Laelianus:
"Little is known about this usurper except that he led a revolt against Postumus, which was speedily suppressed."
Laelianus is one of more than a few Third Century emperors and usurpers about which history has little real knowledge. What is known about him has been gleaned mostly from his coins. He struck coins at the mint of Moguntiacum, near modern Mainz.
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