Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Kingdom of Essex
Table title:
List of kings
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Reign </th><th colspan=1 rowspan=1 > Incumbent </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 527 to 587 </td><td colspan=1 rowspan=1 > (perhaps) Æscwine or Erchenwine </td><td colspan=1 rowspan=1 > First king according to some sources, others saying son Sledd was first </td></tr>
<tr> <td colspan=1 rowspan=1 > 587 to ante 604 </td><td colspan=1 rowspan=1 > Sledd </td><td colspan=1 rowspan=1 > Son of Æscwine/Erchenwine </td></tr>
<tr> <td colspan=1 rowspan=1 > ante 604 to 616/7? </td><td colspan=1 rowspan=1 > Sæberht </td><td colspan=1 rowspan=1 > Son of Sledd </td></tr>
<tr> <td colspan=1 rowspan=1 > 616/7? to 623? </td><td colspan=1 rowspan=1 > Sexred </td><td colspan=1 rowspan=1 > Son of Sæberht. Joint king with Saeward and a third brother; killed in battle against the West Saxons </td></tr>
<tr> <td colspan=1 rowspan=1 > 616/7? to 623? </td><td colspan=1 rowspan=1 > Saeward </td><td colspan=1 rowspan=1 > Son of Sæberht. Joint king with Sexred and a third brother; killed in battle against the West Saxons </td></tr>
<tr> <td colspan=1 rowspan=1 > 616/7? to 623? </td><td colspan=1 rowspan=1 > (another son of Sæberht name unknown) </td><td colspan=1 rowspan=1 > Joint king with Sexred and Saeward; killed in battle against the West Saxons </td></tr>
<tr> <td colspan=1 rowspan=1 > 623? to ante c.653 </td><td colspan=1 rowspan=1 > Sigeberht the Little </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > c.653 to 660 </td><td colspan=1 rowspan=1 > Sigeberht the Good </td><td colspan=1 rowspan=1 > Apparently son of Sæward. Saint Sigeberht; Saint Sebbi (Feast Day 29 August) </td></tr>
<tr> <td colspan=1 rowspan=1 > 660 to 664 </td><td colspan=1 rowspan=1 > Swithhelm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 664 to 683 </td><td colspan=1 rowspan=1 > Sighere </td><td colspan=1 rowspan=1 > son of a Sigeberht, probably 'the Good'. Joint-king with Sæbbi </td></tr>
<tr> <td colspan=1 rowspan=1 > 664 to c.694 </td><td colspan=1 rowspan=1 > Sæbbi </td><td colspan=1 rowspan=1 > Son of Sexred. Joint-king with Sighere; abdicated in favour of his son Sigeheard </td></tr>
<tr> <td colspan=1 rowspan=1 > c.694 to c.709 </td><td colspan=1 rowspan=1 > Sigeheard </td><td colspan=1 rowspan=1 > Joint-king with his brother Swaefred </td></tr>
<tr> <td colspan=1 rowspan=1 > c.695 to c.709 </td><td colspan=1 rowspan=1 > Swæfred </td><td colspan=1 rowspan=1 > Son of Sæbbi. Joint-king with his brother Sigeheard </td></tr>
<tr> <td colspan=1 rowspan=1 > c. 709 </td><td colspan=1 rowspan=1 > Offa </td><td colspan=1 rowspan=1 > Joint-king during latter part of reign of Swæfred and perhaps Sigeheard </td></tr>
<tr> <td colspan=1 rowspan=1 > c.709? to 746 </td><td colspan=1 rowspan=1 > Saelred </td><td colspan=1 rowspan=1 > Representing distant line descended from Sledd. Probably joint-king with Swaefbert </td></tr>
<tr> <td colspan=1 rowspan=1 > c.715 to 738 </td><td colspan=1 rowspan=1 > Swæfbert </td><td colspan=1 rowspan=1 > Probably joint-king with Saelred </td></tr>
<tr> <td colspan=1 rowspan=1 > 746 to 758 </td><td colspan=1 rowspan=1 > Swithred </td><td colspan=1 rowspan=1 > Grandson of Sigeheard </td></tr>
<tr> <td colspan=1 rowspan=1 > 758 to 798 </td><td colspan=1 rowspan=1 > Sigeric </td><td colspan=1 rowspan=1 > Son of Saelred. Abdicated </td></tr>
<tr> <td colspan=1 rowspan=1 > 798 to 812 </td><td class="highlighted"  colspan=1 rowspan=1 > Sigered </td><td colspan=1 rowspan=1 > Son of Sigeric. Mercia defeated by Egbert of Wessex, sub-kingdom of Essex subsumed into Wessex; from 812 to about 825 held it only as dux. </td></tr>
</table>
Question:
Who was the last king of Essex?
Answer:
Sigered was the last king of Essex.