Landa's voiced idle quote reveals he is actually an agent of Pantalone's. He may have been the one sent to Mondstadt to ruin its wine industry under the guise of being a Snezhnayan merchant, who ultimately fled after witnessing Noelle's overly-dutiful nature.
Like the other Harbingers, Pantalone's alias is derived from a stock character in commedia dell'arte, a type of Italian theater which uses masks to designate their character's role in the story.
"Pantalone" is greedy and uses his high social standing to push others around and interfere with their business. Oftentimes, he is the father of one of the Innamorati and tries to keep the two lovers apart. In other versions, he is married to La Signora.
In Moment of Cessation lore (from the Pale Flame artifact set), it was stated that he was once poor and that he has never received a vision.