reply to post by the2ofusr1
I think you are referring to the "Western Schism" event which happened in 1378.
It is explained in detail here:
www.newadvent.org...
The short answer though is that there was only one validly elected pope, that French cardinal was chosen as anti-pope after the first valid election,
and the council of Pisa was not approved by either the true pope or the anti-pope, and its sessions resulted in a second anti-pope. The Council of
Constance put the matter to rest when the true pope resigned and recognized the Council's authority to appoint a successor.
By substituting a modern political reality, it is easier to see the premises upon which this argument against the Catholic Church was built. Just as
the United States did not ever have "two presidents at one time", only a period in late 2000 when there was a question over who was the rightful
president of the United States, so the Catholic Church never had "three popes".
This is the chain of Succession from St. Peter to present:
1. St. Peter (32-67)
2. St. Linus (67-76)
3. St. Anacletus (Cletus) (76-88)
4. St. Clement I (88-97)
5. St. Evaristus (97-105)
6. St. Alexander I (105-115)
7. St. Sixtus I (115-125) — also called Xystus I
8. St. Telesphorus (125-136)
9. St. Hyginus (136-140)
10. St. Pius I (140-155)
11. St. Anicetus (155-166)
12. St. Soter (166-175)
13. St. Eleutherius (175-189)
14. St. Victor I (189-199)
15. St. Zephyrinus (199-217)
16. St. Callistus I (217-22)
17. St. Urban I (222-30)
18. St. Pontain (230-35)
19. St. Anterus (235-36)
20. St. Fabian (236-50)
21. St. Cornelius (251-53)
22. St. Lucius I (253-54)
23. St. Stephen I (254-257)
24. St. Sixtus II (257-258)
25. St. Dionysius (260-268)
26. St. Felix I (269-274)
27. St. Eutychian (275-283)
28. St. Caius (283-296) — also called Gaius
29. St. Marcellinus (296-304)
30. St. Marcellus I (308-309)
31. St. Eusebius (309 or 310)
32. St. Miltiades (311-14)
33. St. Sylvester I (314-35)
34. St. Marcus (336)
35. St. Julius I (337-52)
36. Liberius (352-66)
37. St. Damasus I (366-83)
38. St. Siricius (384-99)
39. St. Anastasius I (399-401)
40. St. Innocent I (401-17)
41. St. Zosimus (417-18)
42. St. Boniface I (418-22)
43. St. Celestine I (422-32)
44. St. Sixtus III (432-40)
45. St. Leo I (the Great) (440-61)
46. St. Hilarius (461-68)
47. St. Simplicius (468-83)
48. St. Felix III (II) (483-92)
49. St. Gelasius I (492-96)
50. Anastasius II (496-98)
51. St. Symmachus (498-514)
52. St. Hormisdas (514-23)
53. St. John I (523-26)
54. St. Felix IV (III) (526-30)
55. Boniface II (530-32)
56. John II (533-35)
57. St. Agapetus I (535-36) — also called Agapitus I
58. St. Silverius (536-37)
59. Vigilius (537-55)
60. Pelagius I (556-61)
61. John III (561-74)
62. Benedict I (575-79)
63. Pelagius II (579-90)
64. St. Gregory I (the Great) (590-604)
65. Sabinian (604-606)
66. Boniface III (607)
67. St. Boniface IV (608-15)
68. St. Deusdedit (Adeodatus I) (615-18)
69. Boniface V (619-25)
70. Honorius I (625-38)
71. Severinus (640)
72. John IV (640-42)
73. Theodore I (642-49)
74. St. Martin I (649-55)
75. St. Eugene I (655-57)
76. St. Vitalian (657-72)
77. Adeodatus (II) (672-76)
78. Donus (676-78)
79. St. Agatho (678-81)
80. St. Leo II (682-83)
81. St. Benedict II (684-85)
82. John V (685-86)
83. Conon (686-87)
84. St. Sergius I (687-701)
85. John VI (701-05)
86. John VII (705-07)
87. Sisinnius (708)
88. Constantine (708-15)
89. St. Gregory II (715-31)
90. St. Gregory III (731-41)
91. St. Zachary (741-52)
92. Stephen II (752) — Because he died before being consecrated, some lists (including the Vatican’s official list) omit him.
93. Stephen III (752-57)
94. St. Paul I (757-67)
95. Stephen IV (767-72)
96. Adrian I (772-95)
97. St. Leo III (795-816)
98. Stephen V (816-17)
99. St. Paschal I (817-24)
100. Eugene II (824-27)
101. Valentine (827)
102. Gregory IV (827-44)
103. Sergius II (844-47)
104. St. Leo IV (847-55)
105. Benedict III (855-58)
106. St. Nicholas I (the Great) (858-67)
107. Adrian II (867-72)
108. John VIII (872-82)
109. Marinus I (882-84)
110. St. Adrian III (884-85)
111. Stephen VI (885-91)
112. Formosus (891-96)
113. Boniface VI (896)
114. Stephen VII (896-97)
115. Romanus (897)
116. Theodore II (897)
117. John IX (898-900)
118. Benedict IV (900-03)
119. Leo V (903)
120. Sergius III (904-11)
121. Anastasius III (911-13)
122. Lando (913-14)
123. John X (914-28)
124. Leo VI (928)
125. Stephen VIII (929-31)
126. John XI (931-35)
127. Leo VII (936-39)
128. Stephen IX (939-42)
129. Marinus II (942-46)
130. Agapetus II (946-55)
131. John XII (955-63)
132. Leo VIII (963-64)
133. Benedict V (964)
134. John XIII (965-72)
135. Benedict VI (973-74)
136. Benedict VII (974-83)
137. John XIV (983-84)
138. John XV (985-96)
139. Gregory V (996-99)
140. Sylvester II (999-1003)
141. John XVII (1003)
142. John XVIII (1003-09)
143. Sergius IV (1009-12)
144. Benedict VIII (1012-24)
145. John XIX (1024-32)
146. Benedict IX (1032-45) Benedict IX appears on this list three separate times, because he was twice removed and restored
147. Sylvester III (1045)
148. Benedict IX (1045)
149. Gregory VI (1045-46)
150. Clement II (1046-47)
151. Benedict IX (1047-48)
152. Damasus II (1048)
153. St. Leo IX (1049-54)
154. Victor II (1055-57)
155. Stephen X (1057-58)
156. Nicholas II (1058-61)
157. Alexander II (1061-73)
158. St. Gregory VII (1073-85)
159. Blessed Victor III (1086-87)
160. Blessed Urban II (1088-99)
161. Paschal II (1099-1118)
162. Gelasius II (1118-19)
163. Callistus II (1119-24)
164. Honorius II (1124-30)
165. Innocent II (1130-43)
166. Celestine II (1143-44)
167. Lucius II (1144-45)
168. Blessed Eugene III (1145-53)
169. Anastasius IV (1153-54)
170. Adrian IV (1154-59)
171. Alexander III (1159-81)
172. Lucius III (1181-85)
173. Urban III (1185-87)
174. Gregory VIII (1187)
175. Clement III (1187-91)
176. Celestine III (1191-98)
177. Innocent III (1198-1216)
178. Honorius III (1216-27)
179. Gregory IX (1227-41)
180. Celestine IV (1241)
181. Innocent IV (1243-54)
182. Alexander IV (1254-61)
183. Urban IV (1261-64)
184. Clement IV (1265-68)
185. Blessed Gregory X (1271-76)
186. Blessed Innocent V (1276)
187. Adrian V (1276)
188. John XXI (1276-77)
189. Nicholas III (1277-80)
190. Martin IV (1281-85)
191. Honorius IV (1285-87)
192. Nicholas IV (1288-92)
193. St. Celestine V (1294)
194. Boniface VIII (1294-1303)
195. Blessed Benedict XI (1303-04)
196. Clement V (1305-14)
197. John XXII (1316-34)
198. Benedict XII (1334-42)
199. Clement VI (1342-52)
200. Innocent VI (1352-62)
201. Blessed Urban V (1362-70)
202. Gregory XI (1370-78)
203. Urban VI (1378-89)
204. Boniface IX (1389-1404)
205. Innocent VII (1404-06)
206. Gregory XII (1406-15)
207. Martin V (1417-31)
208. Eugene IV (1431-47)
209. Nicholas V (1447-55)
210. Callistus III (1455-58)
211. Pius II (1458-64)
212. Paul II (1464-71)
213. Sixtus IV (1471-84)
214. Innocent VIII (1484-92)
215. Alexander VI (1492-1503)
216. Pius III (1503)
217. Julius II (1503-13)
218. Leo X (1513-21)
219. Adrian VI (1522-23)
220. Clement VII (1523-34)
221. Paul III (1534-49)
222. Julius III (1550-55)
223. Marcellus II (1555)
224. Paul IV (1555-59)
225. Pius IV (1559-65)
226. St. Pius V (1566-72)
227. Gregory XIII (1572-85)
228. Sixtus V (1585-90)
229. Urban VII (1590)
230. Gregory XIV (1590-91)
231. Innocent IX (1591)
232. Clement VIII (1592-1605)
233. Leo XI (1605)
234. Paul V (1605-21)
235. Gregory XV (1621-23)
236. Urban VIII (1623-44)
237. Innocent X (1644-55)
238. Alexander VII (1655-67)
239. Clement IX (1667-69)
240. Clement X (1670-76)
241. Blessed Innocent XI (1676-89)
242. Alexander VIII (1689-91)
243. Innocent XII (1691-1700)
244. Clement XI (1700-21)
245. Innocent XIII (1721-24)
246. Benedict XIII (1724-30)
247. Clement XII (1730-40)
248. Benedict XIV (1740-58)
249. Clement XIII (1758-69)
250. Clement XIV (1769-74)
251. Pius VI (1775-99)
252. Pius VII (1800-23)
253. Leo XII (1823-29)
254. Pius VIII (1829-30)
255. Gregory XVI (1831-46)
256. Blessed Pius IX (1846-78)
257. Leo XIII (1878-1903)
258. St. Pius X (1903-14)
259. Benedict XV (1914-22)
260. Pius XI (1922-39)
261. Pius XII (1939-58)
262. Blessed John XXIII (1958-63)
263. Paul VI (1963-78)
264. John Paul I (1978)
265. John Paul II (1978-2005)
266. Benedict XVI (2005—)