Will add a bit to what has been posted here, for anyone interested.
Robert Henry Maury (1838-1870) was the son and sixth child of Hon. John Walker Maury (1809-1855) and Isabella (Isabel) Foyles (1813-1889) - daughter of Thomas Foyles - of Washington, DC (Many of this family are buried in Congressional cemetery in Washington, DC).
John Walker Maury - Robert's father - was a banker and also the 14th mayor of Washington, DC.
Robert's parents had 15 children, one of whom - Robert Henry's sister - was Lucy Fontaine Maury (1852-1925), wife of Dudley Sanford Gregory (gg grandparents of my 3 sons).
I have additional information on his immediate family.Write for further details, if desired.
Also, I am interested in learning more of his mother's family (Foyles).