viator

Every man, while as viator he walks lifes via non tuta, has his guardian angel.

In six weeks he was back again at Trieste and so ended Viator's 375 last expedition.

Then viator (though it sounds all right) is doubtful; it has too much, perhaps, the sense of wayfarer?

It was also introduced into the Margarita Philosophica of 1815, in the same appendix with the new perspective from Viator.