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:
List of archbishops of Luxembourg
Table title:
Bishops of Luxembourg
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Start date </th><th colspan=1 rowspan=1 > End date </th></tr>
<tr> <td colspan=1 rowspan=1 > Nicolas Adames </td><td colspan=1 rowspan=1 > 26 June 1870 </td><td colspan=1 rowspan=1 > 27 September 1883 </td></tr>
<tr> <td colspan=1 rowspan=1 > Jean Joseph Koppes </td><td colspan=1 rowspan=1 > 4 November 1883 </td><td colspan=1 rowspan=1 > 29 November 1918 </td></tr>
<tr> <td colspan=1 rowspan=1 > Pierre Nommesch </td><td colspan=1 rowspan=1 > 8 March 1920 </td><td colspan=1 rowspan=1 > 9 September 1935 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Joseph Laurent Philippe </td><td colspan=1 rowspan=1 > 9 September 1935 </td><td colspan=1 rowspan=1 > 21 October 1956 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Léon Lommel </td><td class="highlighted"  colspan=1 rowspan=1 > 21 October 1956 </td><td colspan=1 rowspan=1 > 13 February 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > Jean Hengen </td><td colspan=1 rowspan=1 > 13 February 1971 </td><td colspan=1 rowspan=1 > 23 April 1988 </td></tr>
</table>
Question:
Who succeeded Joseph Philippe as bishop of Luxembourg and when?
Answer:
Léon Lommel succeeded Joseph Philippe as the bishop of Luxembourg on 21 October 1956.