Gissur

Gissur is a Nord beggar in Skyrim.

Interactions
He is first encountered during the quest Diplomatic Immunity inside the Thalmor Embassy, in Elenwen's Solar, arguing with Rulindil. He can be killed there.

If not, he later can be encountered inside the Ratway during the quest A Cornered Rat where he will attack the Dragonborn. There, he carries Gissur's Note with him.

He can also be killed while sneaking around the Flagon during "A Cornered Rat". If any of the patrons are asked for information regarding Esbern in the Ragged Flagon while Gissur is there, it will trigger an event where he then leaves the Ragged Flagon to meet with a Thalmor wizard accompanied by two Thalmor soldiers. He informs them that the Blades agent is in the Ragged Flagon asking about the old man.

The group of them then head to Ragged Flagon together. They will attack on sight, but if the Dragonborn manages to evade them, they will go into the tavern and ask where they might find the one asking about Esbern. The Flagon staff and Thieves Guild patrons refuse to cooperate, even after threats, and eventually the three Thalmor will leave. Gissur, however, remains behind and will from then on attack the Dragonborn on sight.

Trivia

 * If an attempt to pickpocket him is made in the Ragged Flagon and he attacks, the Guild members will slaughter him.
 * Gissur may be found outside the Ratway with the three Thalmor if he misses the Dragonborn and Esbern inside. He and the Thalmor will attack on sight.