Just saw your msg.
I have been researching a Jeremiah O'Mullane who joined the 11th Devonshire Regiment and accompanied a convict ship to Australia (Launceston) in 1845. He later was discharged in Australia and married, etc.
On a recent trip to Ireland, we searched for records in both Cork & Dublin.
There had been a reference to a Jeremiah O'Mullane as a publican in my searches (from Australia). We looked at several databases and found that the 'publican' matter seemed unsubstantiated.
The 'reason' is that there is a reference to a Jeremiah O'Mullane in the 1832 vote, and the 1838 vote). But in both cases, there is no record of a Jeremiah O'Mullane as a registered Licensee. And, the land 'lot' cited as a residence in both cases was farmland, not townland. You can see this from the review undertaken on the voter rolls.
What we did find is that the land in question was also used as a police barracks. It appears that Jeremiah was probably a local trooper (as against a British constable) and 'rented' the land as a police barracks for reasons that are unclear (ie did he get recompense for part/all rent?).
From advice given by the head researcher at the Dublin Archives, many false names were listed on the voter register in order to rig the outcome. It could also have been someone's sense of humour.
I also found that parish records for Cork through to Mallow (where many Mullane's resided) showed Mullane as the dominant name, not O'Mullane. I don't know what to make of this issue, but it is clear that with a shortage of records, we'll probably never know the reality of circumstances 'then'.