Strongest: Late April and when the sun is in Sagittarius
Demon Summoning: Daytime, black candles, ivy, copper, dirt
Barbatos is a demon of communication. Like some of his fellow demons, he tells the summoner of details concerning the past and future and has the power to mend broken relationships as well as create new ones. In particular, he can create friendships between any two people and he also can influence men and women in positions of power. These last two powers can be particularly powerful in combination where a person can not only befriend a person of power but also influence them toward their interests.
The communication powers don't stop there. Barbatos also has the power to give voices to animals, meaning that he can make it so that the conjurer understands what animals are trying to communicate to human beings. It is unlikely that this means the animal in question will actually speak in human language. More likely the demon Duke creates a sort of telepathic translator in order for humans to understand the thoughts being conveyed.
While there are other demons can also help lead the summoner to hidden treasures, Barbatos has the special ability to help the summoner find treasures that are hidden or via magical enchantment. Not only that, but if an item is locked away by magical enchantment, Barbatos can magically unlock this for the conjurer.
Though the Latin word "barbatus" means "bearded", the demon Barbatos is not believed to have a beard in his "human" form, though he does have long, white hair and feathery white wings. When he appears to the summoner he comes with quite an entourage. Four "kings" and their troops follow him when he communicates with humans.
He was once part of the 12 Orders of Angels - specifically the Order of Virtues. It is said that he still retains some sort of credentials with that group, though how this specifically works out is hard to say.