Buddhist Dictionary of Pali Proper Names by G P Malalasekera
cāpā therī
Cāpā Therī:A trapper’s daughter in Vankahāra who became the wife of the ājīvaka Upaka and bore him a son,Subhadda.
When Upaka,unable to bear his wife’s taunts,renounced the world and joined the Order,she followed him to Sāvatthi,and there,having become a nun,attained arahantship.Thig.291-311; ThigA.220ff; SNA.i.259f.