Thomas O'Connor (c. 1819 – October 16, 1887) was an Irish rancher and landowner from County Wexford, Ireland whose estate was reportedly the largest individual land and cattle holding in Texas at the time of his death.
Given Power's diplomatic status, the newly formed independent Republic of Mexico granted them access to the country's unpopulated northern lands.
O'Connor was among the first to reinforce Presidio La Bahía, joining the volunteer regiment commanded by Philip Dimmitt.
His obituary in the San Antonio Express called him "the wealthiest man in Texas and the largest land and cattle owner in the state".
[6] As of 2017[update], his family heirs are the 17th largest private landowners in the United States owning a total of 587,000 acres by the Texas Coastal Plain.