Do you mean Thomas died about 1850 or is his middle initial "D"? I have a Thomas Edmond Phelan but do not know his dates. Then I have a Thomas Phelan born in 1726, married to Elizabeth Howard Day. They had two sons, Thomas and Jesse (of record). Then I have a Thomas Phelan from Arkansas who had applied for a pension for service in the civil war but was denied because he lacked a full six months of continuous service.