Another example is the study of configurations; its history is given in §1.2 of Branko Grünbaum's Configurations of Points and Lines, Graduate Studies in Mathematics volume 103, American Mathematical Society, 2009.
Broadly, this area of combinatorics, though not defined in full generality until 1876 by Theodor Reye, encompasses work of Pappus and Desargues. Other names associated with work up to 1910 include Möbius, Cayley, Burnside, and Steinitz. Then there was a "dark ages" until 1990 when Grünbaum and others reinvigorated the field. (I was fortunate to attend a topics class he taught on this material at the University of Washington in the early 1990s.) It is now an active area of research.
By the way, there is a statement about configurations from Hilbert & Cohn-Vossen's Geometry and the Imagination that Grünbaum considers an overstatement:
H & C-V: "...there was a time when the study of configurations was considered the most important branch of geometry."
G: "The author would like to conjecture that this is the greatest exaggeration of the truth that can be found in any of Hilbert's writings. While it is a fact that---as mentioned above---in the "classical period" of the history of configurations there were quite a few people interested in the topic, configurations were never a central topic of mathematical (or geometric) research."