Cearl, king of Mercia in early seventh century
Penda, king of Mercia (626 - 15 November 655 [Battle of Winwæd])
Wulfhere, king of Mercia (658-75)
Æthelred, king of Mercia (675 - 704 [resigned, became a monk])
Coenred, king of Mercia (704-9 [resigned, went to Rome])
Ceolred, king of Mercia (709-16)
Æthelbald, king of Mercia (716-57)
Beornred, king of Mercia (757)
Offa, king of Mercia (757 - 29 July 796)
Ecgfrith, king of Mercia (796 - 17 December 796)
Coenwulf, king of Mercia (796 - 821)
Ceolwulf I, king of Mercia (821-3)
Beornwulf, king of Mercia (823-5)
Ludeca, king of Mercia (825-7)
Wiglaf, king of Mercia (827-9 [defeated by Ecgberht of Wessex], 830-40)
Beorhtwulf, king of Mercia (840-52)
Burgred, king of Mercia (852-74)
Ceolwulf II, king of Mercia (874-877/9? [defeated by Vikings])
Ealdorman Æthelred, leader of Mercia, under Alfred the Great by 883 (879×883-911)
Lady Æthelflæd, daughter of Alfred, husband of Æthelred, led Mercia under Alfred (911-8)
Ælfwynn, daughter of Æthelred and Æthelflæd, deprived of authority and taken into Wessex 918
From: www.anglo-saxons.net