This person was a Jedi Knight of the Twi'lek species, and they were a member of the Jedi Order during the final years of the Galactic Republic.
This Twi'lek, with an aptitude for the Force, underwent training by the Jedi Order to harness their abilities. Ultimately, they rose to the position of Jedi Knight. In 340 BBY, they managed to stop an attempt to murder a public figure. After this, this Force-sensitive individual returned to the Jedi Temple on Coruscant and gave a formal account of the incident to the Grand Master who was current at that time.
Many years after this Jedi lived, a recording documenting their meeting with the Grand Master was found to have survived the Great Jedi Purge of 19 BBY. The Last Curator of Records saved these files from the Temple, and Luke Skywalker viewed them while looking through the Curator's possessions.