Thomas Cullen/Catherine Lanigan

I am researching the family of my ancestor Thomas Cullen, died Victoria, Australia in April 1884, aged 74 years (birth abt 1810?).  His death certificate gives his place of birth as Kilkenny, and his parents as Edward Cullen (farmer) and Catherine Lannigan.

I have checked on RootsIreland, and found the following Catholic baptisms in Diocese of Ossory, Freshford, Kilkenny:

Bridget (Biddy) Cullenan   01 Feb 1818   F: Edward Cullenan  M: Catherine Lanigan  Address: Trenchardstown

Patrick Cullen                  12 Jun 1820   F: Edward Cullen      M: Catherine Lanigan  Address: Trenchardstown

Catherine Cullen               27 Feb 1825  F: Edward Cullen      M: Catherine Lanigan  Address: Trenchardstown

However, I have been unable to find a birth/baptism record for Thomas Cullen, nor a marriage record for his parents. I am wondering if anyone has any further suggestions or information for me re these records. I am also interested in finding out a little about Trenchardstown.

Thomas Cullen was transported to Australia as a convict - convicted in Kilkenny of "Riot and Assault" on 22 Oct 1835, he was sentenced to 7 years. His age is given as 22 yrs (birth abt 1813?). He arrived in Australia aboard the Waterloo in Sept 1836. I am wondering whether there might be any Irish court records or newspaper records which might give further information about his conviction.

Thank you in anticpation of any assistance.

Marilyn