Chalcedonian Christianity edit

• Church of Rome (complete list) –

• Benedict IV, Pope (900–903)
• Leo V, Pope (903–904)
• Sergius III, Pope (904–911)
• Anastasius III, Pope (911–913)
• Lando, Pope (913–914)
• John X, Pope (914–928)
• Leo VI, Pope (928–929)
• Stephen VII, Pope (929–931)
• John XI, Pope (931–935)
• Leo VII, Pope (936–939)
• Stephen VIII, Pope (939–942)
• Marinus II, Pope (942–946)
• Agapetus II, Pope (946–955)
• John XII, Pope (955–964)
• Benedict V, Pope (964)
• Leo VIII, Pope (964–965)
• John XIII, Pope (965–972)
• Benedict VI, Pope (973–974)
• Benedict VII, Pope (974–983)
• John XIV, Pope (983–984)
• John XV, Pope (985–996)
• Gregory V, Pope (996–999)
• Sylvester II, Pope (999–1003)

• Church of Constantinople (complete list) –

• Antony II Kauleas, Patriarch (893–901)
• Nicholas I Mystikos, Patriarch (901–907, 912–925)
• Euthymius I Synkellos, Patriarch (907–912)
• Nicholas I Mystikos, Patriarch (901–907, 912–925)
• Stephen II of Amasea, Patriarch (925–928)
• Tryphon, Patriarch (928–931)
• Theophylact, Patriarch (933–956)
• Polyeuctus, Patriarch (956–970)
• Basil I Scamandrenus, Patriarch (970–974)
• Antony III the Studite, Patriarch (974–980)
• Nicholas II Chrysoberges, Patriarch (984–996)
• Sisinnius II, Patriarch (996–998)
• Sergius II, Patriarch (1001–1019)

Miaphysite Christianity edit

• Armenian Apostolic Church (complete list) –

• Sarkis I, Catholicos (992–1019)

• Coptic Orthodox Church of Alexandria (complete list) –

• Philotheos, Pope (979–1003)

Sunni edit

• Abbasid Caliphate, Baghdad (complete list) –

• al-Mu'tadid, Caliph (892–902)
• al-Muktafi, Caliph (902–908)
• al-Muqtadir, Caliph (908–929, 929–932)
• al-Qahir, Caliph (929, 932–934)
• al-Radi, Caliph (934–940)
• al-Muttaqi, Caliph (940–944)
• al-Mustakfi, Caliph (944–946)
• al-Muti, Caliph (946–974)
• at-Ta'i, Caliph (974–991)
• al-Qadir, Caliph (991–1031)

• Caliphate of Córdoba (complete list) –

• Abd ar-Rahman III, Caliph (929–961)
• Al-Hakam II, Caliph (961–976)
• Hisham II, Caliph (976–1008, 1010–1012)

Shia edit

• Twelver Islam

• Imams (complete list) –
• Muhammad al-Mahdi, Imam (874–present) Shia belief holds that he was hidden by Allah in 874.

• Deputies (complete list) –
• Abu Jafar Muhammad ibn Uthman, Deputy (880–917)
• Abul Qasim Husayn ibn Ruh al-Nawbakhti, Deputy (917–938)
• Abul Hasan Ali ibn Muhammad al-Samarri, Deputy (938–941)

• Marja
• Kulayni(930-941)
• Ibn-e Qūliwayh(941-977) 
• Shaykh Saduq (977-993)
• Al-Sharif al-Radi(993-1015)

• Isma'ili Islam (complete list) –

Fatimid Caliphate in Tunisia

• Abdullah al-Mahdi Billah, Imam (881–934) and Fatimid Caliph (909–934)
• Al-Qa'im bi-Amr Allah, Caliph and Imam (934–946)
• Al-Mansur bi-Nasr Allah, Caliph and Imam (946–953)
• Al-Mu'izz li-Din Allah, Caliph and Imam (953–975)

Transfer to Egypt in 973

• al-Aziz Billah, Caliph and Imam (975–996)
• al-Hakim bi-Amr Allah, Caliph and Imam (996–1021)

• Zaidiyyah (complete list) –

Tabaristan

• Hasan al-Utrush, leader (914–917)
• Abu Muhammad Hasan ibn Qasim, Imam (917–919, 919–923, 927–928)
• Abu 'l-Husayn Ahmad ibn Hasan, Imam (919, 923)
• Abu 'l-Qasim Ja'far ibn Hasan, Imam (919, 923–925)
• Abu Ali Muhammad ibn Abu 'l-Husayn Ahmad, Imam (925–927)
• Abu Ja'far Husayn ibn Abu 'l-Husayn Ahmad, Imam (927)

Yemen

• al-Hadi ila'l-Haqq Yahya, Imam (897–911)
• al-Murtada Muhammad, Imam (911–913)
• an-Nasir Ahmad, Imam (913–934 or 937)
• al-Muntakhab al-Hasan, Imam (934–936 or 939)
• al-Mukhtar al-Qasim, Imam (936–956)
• al-Mansur Yahya, Imam (934–976)
• ad-Da'i Yusuf, Imam (977–999)
• al-Mansur al-Qasim al-Iyyani, Imam (999–1002)

• Exilarch (complete list) –

• Ukba, Exilarch (deposed, reinstated 918, deposed soon after)
• David ben Zakkai, Exilarch (921–940)

Karaite Judaism edit

• Exilarch (complete list) –

  David ben Boaz (10th century)

  Solomon ben David (late 10th–early 11th centuries)

Talmudic Academies in Mesopotamia edit

• Pumbedita Academy (complete list) –

• Kimoi ben R. Ahhai, Gaon (896–905)
• Mebasser Kahana ben R. Kimoi, Gaon (905–917)
• Kohen Tzedek Kahana ben Joseph, Gaon (917–922)
• Zemah ben Kafnai, Gaon (935–937)
• Hananiah ben Yehudai, Gaon (937–943)
• Aaron ibn Sargado, Gaon (943–960)
• Nehemiah ben Kohen Tzedek, Gaon (960–968)
• Sherira Gaon, Gaon (968–1006)

• Sura Academy (complete list) –

• Hilai ben Natronai ben Hilai, Gaon (896–904)
• Shalom ben Mishael, Gaon (904)
• Jacob ben Natronai, Gaon (911–924)
• Yom-Tob Kahana ben R. Jacob, Gaon (924)
• Saadia Gaon, Gaon (928–942)
• Joseph ben Jacob, Gaon (930)
• Zemah Tzedek ben Paltoi ben Isaac, Gaon (c.990–c.998)
• Samuel ben Hofni, Gaon (c.998–c.1012)

Palestinian Gaonate edit

• Aaron ben Meïr, Nasi (early tenth century)

• Religious leaders by year