Help:Table would be the place to look. But before you rush off, what do you have in mind? There doesn't seem much point in duplicating other lists, if that's what's meant. If you meant "create a column for each polity at  and then show what happened to it between then and whenever" that's perhaps useful, but I'm not sure that a table will be all that simple.  
 One option might be: 
 {| class="wikitable" 
 |- 
 ! Hwicce 
 ! Mercia 
 ! Middle Angles 
 ! East Angles 
 ! Surrey 
 ! Kent 
 ! East Saxons 
 ! Middle Saxons 
 ! South Saxons 
 ! West Saxons 
 ! Bernicia 
 ! Deira 
 |- 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 | Rulers 
 |- 
 | Absorbed by Mercia 
 | Absorbed into new Kingdom of the English  
 | Absorbed by Mercia 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 | Blah 
 |} 

 Bleh. Or you could do a timeline. 

 {| class="wikitable" 
 |- 
 ! Century 
 ! Scotland 
 ! Wales 
 ! Northern England 
 ! Middle England 
 ! Southern England 
 |- 
 ! 7th 
 ! Picts, Dál Riata, Alt Clut, Bernicia (later Northumbria) 
 ! Blah 
 ! Bernicia and Deira (later Northumbria), blah 
 ! Mercia, Hwicce, Lindsey, Middle Angles, blah 
 ! Blah 
 |- 
 ! 8th 
 ! Picts, Dál Riata, Alt Clut,Northumbria 
 ! Blah 
 ! Northumbria 
 ! Mercia (incorporating Hwicce, Lindsey, Middle Angles) 
 ! Wessex, South Saxons, Kent, blah 
 |- 
 ! 10th 
 ! Alba, Strathclyde, York, Dublin 
 ! Blah 
 ! York, Dublin, England 
 ! England, York, East Anglia 
 ! England 
 |} 

 Still horrid. Imagemaps? Include Ireland or not? There are lots and lots of ways to skin this particular cat. Probably best to get an agreement on which is preferred before rushing off.