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:
Hartlepool Abbey
Table title:
List of abbesses
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Date appointed Abbess </th><th colspan=1 rowspan=1 > Date Left </th><th colspan=1 rowspan=1 > Notes </th><th colspan=1 rowspan=1 > went to </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Hieu </td><td class="highlighted"  colspan=1 rowspan=1 > 640AD </td><td class="highlighted"  colspan=1 rowspan=1 > 649AD </td><td colspan=1 rowspan=1 > Founder of Abbey </td><td colspan=1 rowspan=1 > Tadcaster </td></tr>
<tr> <td colspan=1 rowspan=1 > Hilda </td><td colspan=1 rowspan=1 > 649AD </td><td colspan=1 rowspan=1 > 658AD </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Whitby Abbey </td></tr>
</table>
Question:
When was Hartlepool Abbey presided over by Hieu?
Answer:
From 640-649, Hartlepool Abbey was presided over by Hieu.