This is the 727th most frequent Icelandic word.
gísli
The Icelandic word "gísli" traditionally refers to a "hostage" or "pledge." It is also used as a male given name.
In this sentence, 'Gísli' is used as a proper noun, representing a person's name typically found in Icelandic culture.
Gísli átti frábæran hest sem hét Leifur.
Gísli had a wonderful horse named Leifur.
Here, 'gísli' refers to a hostage, using the term in a specific context to mean someone held or taken within a confined situation.
Við fórum í leynileiðangur, og ég var gísli hópsins.
We went on a secret mission, and I was the group's hostage.
Within this sentence, 'Gísli' is again serving as a proper name, showing how it can be a direct address to a person.