Thomas Davis's "A Nation Once Again" was published with the tune (given below) in James Duffy's 'The Spirit of the Nation', 1845. Davis was born on Oct. 14, 1814, and died Sept. 16, 1845.

X:1
T:A Nation Once Again, by Thomas Davis
S:Duffy's 'Spirit of the Nation', 1845
Q:120
L:1/8
M:6/8
K:F
C|F3/2G/AA2A|B3/2A/GG2G|A3/2B/c cdA|A3G2C|F3/2G/AA2A|\
AGCB3|AGF cBA|A2GF2||c/d/|_e2ee2e|_e2ee2e|d3/2c/B f3/2e/d|\
d3c2A|B2BB2B|B3(3 B/A/G/ c2B|A3/2G/F c3/2B/A|A3G2C|\
F3/2G/AA2F|FAcd2c|fed cdA|{A}G3F2|]