The only information I have been able to find on this particular Yakumo Jinja is from a notice board in its grounds. It used to be known as Tennõ-Gü (天王宮,) and its enshrined kami was Gozu-tennō. Come the Meiji Restoration and the Shinbutsu-bunri, however, the shrine was formally named Yakumo Jinja and its kami Susano-o.
Exactly when it was founded is not clear, but there is evidence that there was some kind of shrine on the site about 700 years ago. The site fronts on what was the old Kamakura Highway ( 古鎌倉街道) and in its north-east corner there is a small stone memorial tower embedded in a tree which dates to 1319.
The in-ground Inari Jinja is thought to be as old as what was Tennõ-Gü.
About seven minutes on foot from Bubaigawara Station. The current main hall was built in 1860 and remodelled in 2007. In a corner of the grounds there is a small burial mound, the Tennōtsuka kofun (天王塚古墳) which has been left unexcavated since it was raised in the sixth century. One of those jinja of more historical than visual appeal.
(Note: numbers in parentheses after kami names
From Merged Shrines
Inari Jinja 稲荷神社
Annual Festival: nearest weekend to July 14 & 15