The head of the Catholic Church was the pope.
In 1054, the Catholic Church divided into the Roman Catholic Church, headed by the pope, and the Eastern Orthodox Church, headed by the patriarch of Constantinople.
There were many other churches as well, through the entire time, but they were small, and varied in their leadership.
Our Blessed Lord, Jesus Christ, has always been the head of the Catholic Church. On earth, He has been represented, since the time of His ascension until the end of the world by His Vicar, the Holy Father in Rome - who would be considered the Visible head of the Church. Wikipedia list the Medieval period as the 5th century through the 15th century, the popes during that time would have been:
39.St. Anastasius I (399-401)
40.St. Innocent I (401-17)
41.St. Zosimus (417-18)
42.St. Boniface I (418-22) Opposed by Eulalius, antipope (418-419)
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) Opposed by Laurentius, antipope (498-501)
52.St. Hormisdas (514-23)
53.St. John I (523-26)
54.St. Felix IV (III) (526-30)
55.Boniface II (530-32) Opposed by Dioscorus, antipope (530)
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) Opposed by Theodore and Paschal, antipopes (687)
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, many authoritative lists omit him
93.Stephen III (752-57)
94.St. Paul I (757-67)
95.Stephen IV (767-72) Opposed by Constantine II (767) and Philip (768), antipopes (767)
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) Opposed by John, antipope (855)
104.St. Leo IV (847-55)
105.Benedict III (855-58) Opposed by Anastasius, antipope (855)
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) Opposed by Christopher, antipope (903-904)
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) Benedict and John XIV were opposed by Boniface VII, antipope (974; 984-985)
137.John XIV (983-84)
138.John XV (985-96)
139.Gregory V (996-99) Opposed by John XVI, antipope (997-998)
140.Sylvester II (999-1003)
141.John XVII (1003)
142.John XVIII (1003-09)
143.Sergius IV (1009-12)
144.Benedict VIII (1012-24) Opposed by Gregory, antipope (1012)
145.John XIX (1024-32)
146.Benedict IX (1032-45) He appears on this list three separate times, because he was twice deposed and restored
147.Sylvester III (1045) Considered by some to be an antipope
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) Opposed by Benedict X, antipope (1058)
157.Alexander II (1061-73) Opposed by Honorius II, antipope (1061-1072)
158.St. Gregory VII (1073-85) Gregory and the following three popes were opposed by Guibert ("Clement III"), antipope (1080-1100)
159.Blessed Victor III (1086-87)
160.Blessed Urban II (1088-99)
161.Paschal II (1099-1118) Opposed by Theodoric (1100), Aleric (1102) and Maginulf ("Sylvester IV", 1105-1111), antipopes (1100)
162.Gelasius II (1118-19) Opposed by Burdin ("Gregory VIII"), antipope (1118)
163.Callistus II (1119-24)
164.Honorius II (1124-30) Opposed by Celestine II, antipope (1124)
165.Innocent II (1130-43) Opposed by Anacletus II (1130-1138) and Gregory Conti ("Victor IV") (1138), antipopes (1138)
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) Opposed by Octavius ("Victor IV") (1159-1164), Pascal III (1165-1168), Callistus III (1168-1177) and Innocent III (1178-1180), antipopes
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) Opposed by Nicholas V, antipope (1328-1330)
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) Opposed by Robert of Geneva ("Clement VII"), antipope (1378-1394)
204.Boniface IX (1389-1404) Opposed by Robert of Geneva ("Clement VII") (1378-1394), Pedro de Luna ("Benedict XIII") (1394-1417) and Baldassare Cossa ("John XXIII") (1400-1415), antipopes
205.Innocent VII (1404-06) Opposed by Pedro de Luna ("Benedict XIII") (1394-1417) and Baldassare Cossa ("John XXIII") (1400-1415), antipopes
206.Gregory XII (1406-15) Opposed by Pedro de Luna ("Benedict XIII") (1394-1417), Baldassare Cossa ("John XXIII") (1400-1415), and Pietro Philarghi ("Alexander V") (1409-1410), antipopes
207.Martin V (1417-31)
208.Eugene IV (1431-47) Opposed by Amadeus of Savoy ("Felix V"), antipope (1439-1449)
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)
Charlemagne is the greatest catholic church leader during the Middle Ages. He was crwon as the Holy Roman Empire.
it was the pope
It was Catholic and the Pope was the head.
Most medieval Christians were Catholic and the head of the Catholic Church was the Pope. Popes were usually located in Rome, but there were times when they were in residence elsewhere. The head of the Eastern Orthodox Church, which was divided from the Roman Catholic Church in 1054, was in Constantinople. There were other church sects but they were much smaller.
The Catholic Church
The pope is the head of the Catholic Church. There is only one Catholic Church and it is not a sect. To be a Catholic Church, a church must be in union with the pope. If they are not in union with the pope, they are not Catholic.
The head Quarters of the Roman Catholic church is The Vatican Rome
The pope is the head of the Catholic Church. There is only one Catholic Church and it is not a sect. To be a Catholic Church, a church must be in union with the pope. If they are not in union with the pope, they are not Catholic.
Latin
Catholic
Pope
The church was Catholic so it was the Pope and the priests.
The Catholic Church, or simply "the Church": there was no other in medieval Europe, and it certainly wasn't referred to as the Roman Catholic Church until the protestant revolt in England centuries later. The center of the Church was in Rome; the word "catholic" means universal. It was meant as the "universal church", or the church for everybody.
No king has ever replaced a pope as head of the Catholic Church. Henry VIII did break from the Catholic Church and formed what is the Church of England but which is not a Catholic Church as it is not in union with Rome.