Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Birth | Marriage | Became Queen | Ceased to be Queen | Death | Spouse |
| --- | --- | --- | --- | --- | --- | --- |
| Charlotte, Princess Royal | 29 September 1766 | 18 May 1797 | 1 January 1806 elevated from Electress | 30 October 1816 husband's death | 5 October 1828 | Frederick I |
| Catherine Pavlovna of Russia | 10 May 1788 | 24 January 1816 | 30 October 1816 husband's accession | 19 January 1819 | 19 January 1819 | William I |
| Pauline Therese of Württemberg | 4 September 1800 | 15 April 1820 | 15 April 1820 | 25 June 1864 husband's death | 10 May 1873 | William I |
| Olga Nikolaevna of Russia | 11 September 1822 | 13 July 1848 | 25 June 1864 husband's accession | 6 October 1891 husband's death | 30 October 1892 | Charles I |
| Charlotte of Schaumburg-Lippe | 10 October 1864 | 8 April 1886 | 6 October 1891 husband's accession | 30 November 1918 husband's abdication | 16 July 1946 | William II |
Question:
Who is the spouse of the person born on 29 September 1766?
Answer:
Frederick I