T. de Thulstrup
From The Arthur Conan Doyle Encyclopedia
Bror Thure Thulstrup aka Thure de Thulstrup (5 april 1848 - 9 june 1930) was a leading Swedish-American illustrator with contributions for numerous magazines, including three decades of work for Harper's Magazines (Weekly and Monthly). Thulstrup primarily illustrated historical military scenes.
In 1893 and 1895, he did 34 illustrations for Arthur Conan Doyle's works.