The seven kingdoms that made up early Anglo-Saxon England, known as the Heptarchy, were governed by men who took the titles of king or duke, depending on whether they were independent entities or subject to other forces. These tables show the most basic information we have on these rulers.

East Anglia

Before 571: Wehha
571-578: Wuffa
578-593: Tyttla
593-617: Raedwald
617-618: Eni
618-628: Eorpwald
628-631: Ricbert
631-634: Sigebert
634-635: Egric
635-654: Anna
654-655: Aethelhere
655-664: Aethelwold
664-713: Ealdwulf
713-749: Aelfwald
749-c.758: Beorna (who ruled jointly with Hun and Alberht from 749 until an unknown date)
c.758-779: Aethelred
779-794: Aethelberht
794-796: Mercian rule
796: Eadwald
796-827: Mercian rule
827-839: Aethelstan
839-855: Aethelweard
855-870: Edmund
870-876: Oswald (sub-king under Norse rule)
876-879: Aethelred (sub-king under Norse rule)
879-890: Guthrum I (Norse ruler)
890-902: Eric (Norse ruler)
902-918: Guthrum II (Norse ruler)
918 onward: Wessex rule

Essex

527-587: Aescwine
587-604: Sledda
604-616: Saebert
616-617: Sexred (who ruled jointly with Saeward and Sexbald for the first year)
617-653: Sigeberht I (Sigeberht the Little)
653-660: Sigeberht II (Sigeberht the Blessed)
660-665: Swithhelm
665-695: Sebbi (who ruled jointly with Sighere until 683)
695-c.715: Swaefred and Sigeheard (who also ruled jointly with Offa in the year 709)
c.715-738: Swaefbert
738-746: Saelred
746-758: Swithred
758-798: Sigeric I
798-825: Sigered (reduced to the title of Duke by Mercian overlords)
825 onward: Wessex rule

Kent

455-488: Hengist
488-512: Aesc (a.k.a. Oeric Oisc)
512-540: Octa
540-560: Eormenric
560-616: Ethelbert I
616-640: Eadbald
640-664: Earconbert
664-673: Ecgbert I
673-685: Hlothere
685-686: Eadric
686-687: Mul
688-690: Oswine
690-725: Wihtraed
725-762: Ethelbert II
762-764: Eanmund
764-765: Heabert (sub-king under Mercian rule)
765-772: Ecgbert II (sub-king under Mercian rule)
772-776: Mercian rule
776-785: Ecgbert II, again (sub-king under Mercian rule; reigned jointly with Ealhmund II in 784 and 785)
785-796: Mercian rule
796-798: Eadbert Praen of Kent
798-807: Cuthred (sub-king under Mercian rule)
807-823: Mercian rule
823-824: Baldred (sub-king under Mercian rule)
824-839: Aethelwulf  (sub-king under Wessex rule)
839-851: Aethelstan  (sub-king under Wessex rule)
851-860: Aethelbert (sub-king under Wessex rule)
860 onward: Wessex rule

Mercia

c.585-593: Creoda
593-606: Pybba
606-626: Ceorl
626-655: Penda
655-656: Peada
655-658: Northumbrian rule
658-675: Wulfhere
675-704: Aethelred I
704-709: Coenred
709-716: Coelred
716: Coelwald
716-757: Aethelbald
757: Beornred
757-796: Offa
796: Ecgfrith
796-821: Coenwulf
821: Cenelm
821-823: Ceolwulf I
823-825: Beornwulf
825-827: Ludecan
827-828: Wiglaf
828-830: Wessex rule
830-840: Wiglaf, again
840: Wigstan
840-852: Beorhtwulf
852-874: Burghred
874-879: Ceolwulf II (sub-king under Norse rule) 
879-911: Aethelred II (became a lord under Wessex governance in 884)
c.888-918: Lady Aethelflaed (governed first jointly with her husband Aethelred, then in her own right)
919 onward: Wessex rule

Northumbria

Northumbria was formed by the merging of two kingdoms: Bernicia and Deira.

Bernicia
c. 500: Esa
c.520-547: Eoppa
547-559: Ida
559-560: Glappa
560-568: Adda
568-572: Aethelric
572-579: Theodric
579-585: Frithuwald
585-593: Hussa
593-616: Aethelfrith
616-633: Edwin of Deira
633-634: Eanfrith
634-642: Oswald
642-670: Oswiu

Deira
559-589: Aelle
589-604: Aethelric
604-616: Aethelfrith
616-633: Edwin
633-634: Osric
634-642: Oswald
642-644: Oswiu of Bernicia
644-651: Oswine
651-656: Aethelwald
656-664: Alchfrith
664-670: Oswiu of Bernicia, again
670-679: Aelfwine

United Northumbria
664-670: Oswiu
670-685: Ecgfrith
685-704: Aeldfrith
704-705: Eadwulf
705-716: Osred I
716-718: Coenred
718-729: Osric
729-737: Ceolwulf
737-758: Eadberht
758-759: Oswulf
759-765: Aethelwald Moll
765-774: Ealchred
774-779: Aethelred I 
779-789: Aelfwald I 
789-790: Osred II
790-796: Aethelred I, again 
796: Osbald
796-806: Eardwulf
806-808: Aelfwald II
808-810: Eardwulf, restored 
810-841: Eanred
841-844: Aethelred II 
844: Raedwulf 
844-848: Aethelred II, again 
848-863: Osbeorht
863-867: Aelle II (usurper) 
866 into the tenth century: Danish rule
 

Sussex

The information available on Sussex is sadly meager. 

Before 685: Aethelwalh
685-686: Berhtun (who ruled jointly with Andhun from 685 to an unknown date)
686-688: Caedwalla
Before 692: Wattus (may be the first to use the title of King)
692-c.714: Nothelm
c.714-c.720: Athelstan
c.720-725: Nunna
725-c.750: Athelbert
758-772: Osmund 
765-c.791: Ealdwulf (whose title was reduced to Duke, and who ruled jointly with Elfwald, Oswald and Oslac for about a year c. 772), 

Wessex

519-534: Cerdic
534-560: Cynric
560-591: Ceawlin
591-597: Ceol
597-611: Ceolwulf
611-643: Cynegils 
643-645: Cenwalh 
645-648: Mercian rule 
648-672: Cenwalh, again 
672-674: Queen Seaxburh of Cenwalh
674: Cenfus
674-676: Aescwine
676-685: Centwine
685-688: Caedwalla
688-726: Ine
726-740: Aethelheard
740-756: Cuthred
756-757: Sigeberht
757-786: Cynewulf
786-802: Beorhtric 
802-839: Egbert (first to claim rule over "all England")
839-858: Aethelwulf
858-860: Aethelbald 
860-865: Aethelbert 
865-871: Aethelred I
871-884: Alfred the Great

Alfred's successes against Danish invasions bolstered his claim of "King of the English." Although all England was not completely united under Alfred, his reign is generally considered to mark the end of the Heptarchy.