These two lines merge at Piers Butler and Margaret FitzGerald. ..1 King Edward I of England (1239 - 1307) .. + Princess Alianore de Castile (1240 - 1290) ....2 Elizabeth Plantagenet (1282 - 1316) .... + Sir Humphrey de Bohun VIII (about 1276 - 1322) ......3 Alianor de Bohun (1304 - 1363) ...... + Sir James Butler (about 1305 - 1338) ........4 Sir James Butler (1331 - 1382) ........ + Elizabeth Darcy ( - 1390) ..........5 Sir James Butler (after 1360 - 1405) .......... + Anne Welles ( - after 1396) ............6 Richard Butler ..............7 Edmund MacRichard Butler ( - 1464) ................8 Sir James Butler ( - 1487) ................ + Sabine Kavanagh ..................9 Sir Piers Butler (about 1467 - 1539) .................. + Margaret FitzGerald ....................10 Helen Butler .................... + Sir Donnchadh O'Brien ( - 1553) ......................11 Sir Connor O'Brien (1535 - 1581) ...................... + Una O'Brien ........................12 Honor O'Brien (1575 - 1600) ........................ + Sir Thomas FitzMaurice (1574 - 1630) ..........................13 Sir Patrick FitzMaurice (1595 - 1661) .......................... + Honora FitzGerald ............................14 Sir William FitzMaurice (1633 - 1697) ............................ + Constance Long ..............................15 Sir Thomas FitzMaurice (1668 - 1741) .............................. + Anne Petty ( - 1737) ................................16 Sir John Petty FitzMaurice (1706 - 1761) ................................ + Mary FitzMaurice ( - 1780) ..................................17 Sir William FitzMaurice (1737 - 1805) ..........5 Eleanor Butler ( - 1390) .......... + Sir Gerald FitzMaurice FitzGerald ( - about 1398) ............6 Sir James FitzGerald ( - 1463) ............ + Mary Burke ..............7 Joan Cam FitzGerald ( - 1486) .............. + Sir Thomas FitzMaurice FitzGerald ( - 1478) ................8 Sir Gerald FitzGerald ( - 1513) ................ + Alison FitzEustace ..................9 Margaret FitzGerald .................. + Sir Piers Butler (about 1467 - 1539) ....................10 Helen Butler .................... + Sir Donnchadh O'Brien ( - 1553) ......................11 Sir Connor O'Brien (1535 - 1581) ...................... + Una O'Brien ........................12 Honor O'Brien (1575 - 1600) ........................ + Sir Thomas FitzMaurice (1574 - 1630) ..........................13 Sir Patrick FitzMaurice (1595 - 1661) .......................... + Honora FitzGerald ............................14 Sir William FitzMaurice (1633 - 1697) ............................ + Constance Long ..............................15 Sir Thomas FitzMaurice (1668 - 1741) .............................. + Anne Petty ( - 1737) ................................16 Sir John Petty FitzMaurice (1706 - 1761) ................................ + Mary FitzMaurice ( - 1780) ..................................17 Sir William FitzMaurice (1737 - 1805)