Ivan Donald Margary, FSA (1896–1976) was a British historian who, during his lifetime, became the leading authority on Roman roads in Great Britain.[1] He wrote numerous works on Roman roads[2] of which his most influential and complete was Roman Roads In Britain.
Margary's primary gift to the study of Roman roads was the development of a catalogue system known as Margary numbers,[1] numbering Roman roads so that they could be referred to by catalogue number to avoid confusion, and to allow cross-referencing of the same road between different studies and authors.