He married a great-granddaughter of Duncan, 8th earl of Levenax (or Lennox), and besides this relationship by marriage the Napiers claimed a lineal male cadency from the ancient family of Levenax.
But, besides the graves of her native saints, Egypt boasts of those of several members of the Prophets family, the tomb of the sayyida Zeyneb, daughter of Ali, that of the sayyida Sekeina, daughter of Hosain, and that of the sayyida Nefisa, great-granddaughter of Hasan, all of which are held in high veneration.
In the same year he married Sarah Pierrepont, then aged seventeen, daughter of James Pierrepont (1659-1714), a founder of Yale, and through her mother great-granddaughter of Thomas Hooker.
This princess, who was a great-granddaughter of the empress Maria Theresa, and a great-niece of Marie Antoinette, endeared herself to the people by her elevated character and indefatigable benevolence, while her beauty gained for her the sobriquet of "The Rose of Brabant"; she was also an accomplished artist and musician, and a fine horsewoman.
A second edition, edited by his great granddaughter Nora Barlow, appeared in 1958.