Maternal grandmother of the composer (b. 8/19 October 1778 in Saint Petersburg; d. 5/17 September 1816), born Yekaterina Mikhaylovna Popova (Екатерина Михайловна Попова); known after her marriage as Yekaterina Mikhaylovna Assier (Екатерина Михайловна Ассиер).
In 1800 she was married to Andrey Assier (1778–1835), and they had five children — Mikhail (b. 1802); Yekaterina (1805–1882); Nikolay (b. 1809); Andrey (b. 1811); and Aleksandra (1812–1854), mother of the composer.
Yekaterina Assier died in 1816, and was buried at Smolenskoye Cemetery in Saint Petersburg.