1558 T. Phaer tr. Virgil ii. 506 W[ith] rammes and engins falles The portall postes & thresholds vp are throwe[n] & dores of halles.
1907 2 Sept. 8/1 The portal posts for the structure give an idea of what a massive concern the bridge was.
2004 (Nexis) 18 Sept. 5 The Star Jasmine is another twining vine that would climb up the portal posts.