In Song of the Lark, Thea "had been interested in Caesar's 'Commentaries' when she left school to begin teaching, and she loved to read about great generals; but these facts would scarcely explain her wanting that grim bald head ["a photograph of the Naples bust of Julius Caesar"] to share her daily existence."
There are many allusions to Caesar's Commentaries throughout Cather's work. For instance, see Chapter 3 in Alexander's Bridge. In One of Ours, Barclay Owens studies Caesar and he and his fortifications and maps are referred to as Caesar and Caesar's. Tom Outland reads Caesar, also.
In "The Joy of Nellie Dean," the narrator likens Guy Franklin to the merchants in Caesar who brought into Gaul "those things which effeminate the mind." In an article in the Courier, Cather writes about explorer Fridtjof Nansen: "There was something in his terseness and economy of verbiage that recalled the Commentaries of Caesar."