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Mortimer Delano de Lannoy
1869–1920
Known today for a witty late-Victorian etiquette book, this little-known writer also appears to have taken a strong interest in family history and heraldry. The surviving record is sparse, which gives his work an unusual, half-forgotten charm.
1 Audiobook
Simplex Munditiis, Gentlemen
by Mortimer Delano de Lannoy, Reginald Harvey Arnold
About the author
Mortimer Delano de Lannoy (1869–1920) is best remembered as the co-author, with Reginald Harvey Arnold, of Simplex Munditiis, Gentlemen, a book that was later reissued and digitized. From the title and surviving catalog records, he seems to have written in the world of manners, dress, and social presentation.
Other library and bookselling records connect him with genealogical and historical material tied to the Delano family, suggesting that family lineage and heraldry were also important interests. A 1902 bookplate preserved by the University of Illinois shows an elaborate armorial design associated with him, reinforcing that connection.
Because confirmed biographical details are limited in the sources available online, much about his life remains unclear. Even so, the traces that survive point to a figure shaped by the refined social culture of his time, with interests ranging from gentlemanly style to ancestry and inherited tradition.