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 heads of government of Mexico City
Table title:
Heads of Government of the Federal District/Mexico City
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > No. </th><th colspan=1 rowspan=1 > Portrait </th><th colspan=1 rowspan=1 > Name (Birth–Death) </th><th colspan=2 rowspan=1 > Term of office </th><th colspan=1 rowspan=1 > Political Party </th></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 1 </th><td colspan=1 rowspan=1 > - </td><td class="highlighted"  colspan=1 rowspan=1 > Cuauhtémoc Cárdenas (born 1934) </td><td colspan=1 rowspan=1 > 5 December 1997 </td><td colspan=1 rowspan=1 > 28 September 1999 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 2 </th><td colspan=1 rowspan=1 > - </td><td class="highlighted"  colspan=1 rowspan=1 > Rosario Robles (born 1956) </td><td colspan=1 rowspan=1 > 29 September 1999 </td><td colspan=1 rowspan=1 > 4 December 2000 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 3 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Andrés Manuel López Obrador (born 1953) </td><td colspan=1 rowspan=1 > 5 December 2000 </td><td colspan=1 rowspan=1 > 29 July 2005 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 4 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Alejandro Encinas Rodríguez (born 1954) </td><td colspan=1 rowspan=1 > 2 August 2005 </td><td colspan=1 rowspan=1 > 4 December 2006 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 5 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Marcelo Ebrard (born 1959) </td><td colspan=1 rowspan=1 > 5 December 2006 </td><td colspan=1 rowspan=1 > 4 December 2012 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 6 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Miguel Ángel Mancera (born 1966) </td><td colspan=1 rowspan=1 > 5 December 2012 </td><td colspan=1 rowspan=1 > 29 March 2018 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 7 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > José Ramón Amieva (born 1972) </td><td colspan=1 rowspan=1 > 29 March 2018 </td><td colspan=1 rowspan=1 > 4 December 2018 </td><td colspan=1 rowspan=1 > Party of the Democratic Revolution </td></tr>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 8 </th><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Claudia Sheinbaum Pardo (born 1962) </td><td colspan=1 rowspan=1 > 5 December 2018 </td><td colspan=1 rowspan=1 > 4 October 2024 (Incumbent) </td><td colspan=1 rowspan=1 > National Regeneration Movement </td></tr>
</table>
Question:
Who was Rosario Robles and who came before him? 
Answer:
Rosario Robles was Head of Government of Mexico City (Federal District) after Cuauhtémoc Cárdenas.