The trumeau (center post) of the eleventh-century portal of the Abbey of St. Pierre at Moissac, in southwestern France. You can find out more about it here:
https://www.khanacademy.org/humanities/medieval-world/romanesque-art/romanesque-art-in-france/a/saint-pierre-moissac
This model was created and published by Zoilo and published by him under the CC Attribution license. Here's the link to his model:
https://sketchfab.com/3d-models/moissac-portal-mullion-5b511b0c50644bb9b95569e907806e6d
I have not changed Zoilo's mesh at all. I have just presented it a bit differently.
This version is also provided under the rules of the CC Attribution license.