Andrey Stamatin

Andrei Stamatin (Андрей Стаматин) is a talented architect, and the eldest of the famous Stamatin brothers. He concedes to his brother Peter in terms of talent, but is much more confident in a conventional life: he's both capable and active, very dangerous to his enemies. He's always ready to fight and terrifying in battle. It's known, for example, that he immediately interrupted four armed men who attacked his brother when he was alone and with only one knife.

Andrei's past
At the first meeting with the Bachelor it turns out that they knew each other when they were students, although obviously they did not study together. During their first conversation they remember a long night of drinking, which turned into a fight in which they both were on one (apparently defending) side.

Andrei's tavern
Andrei holds a tavern on the shores of the Gorkhon, not far from the Verbae, the house of Anna Angel. In this tavern you can buy exotic liquor, according to rumors, prepared according to the recipes received from Odonghe (and which perhaps the Odonghe gave voluntarily). Andrei apparently lives in the tavern (or at least most of the time you can find him there). There is always a twyrine Bride there; Andrei is also likely to have kidnapped her from an Odongh. Thus the steppe is extremely hostile to Andrei.

Knife
Andrei carries a knife which he calls a "navaja". In our world navajas are a type of knifes characteristic of Spain, which suggests that at least one (and possibly both brothers) have been to Spain or its analogues in the world of Pathologic. Generally, in the city there are only ordinary kitchen knives, razors and occasionally scalpels, while other bladed weapons can not be found, so Andrei's navaja may be the only one in town.

Historically, navajas have been short knives used by the common people, arising from the ban on longer blades. We can assume it reflects Andrei's contempt for the status of the nobility; and the very existence of the knife reflects his contempt for the people's prejudices against violating the integrity of the human body.