If other worlds have ever in the past had relations with this earth, they were attempted positivizations: to extend themselves, by colonies, upon this earth; to convert, or assimilate, indigenous inhabitants of this earth.
Or parent-worlds and their colonies here—
Super-Romanimus—
Or where the first Romans came from.
It's as good as the Romulus and Remus story.
Super-Israelimus—
Or that, despite modern reasoning upon this subject, there was once something that was super-parental or tutelary to early orientals.
Azuria, which was tutelary to the early Britons:
Azuria, whence came the blue Britons, whose descendants gradually diluting, like blueing in a wash-tub, where a faucet's turned on, have been most emphasized of sub-tutelarians, or assimilators ever since.
Worlds that were once tutelarian worlds—before this earth became sole property of one of them—their attempts to convert or assimilate—but then the state that comes to all things in their missionary-frustrations—unacceptance by all stomachs of some things; rejection by all societies of some units; glaciers that sort over and cast out stones—