Phan-tu Zenn was a human male heir to the Eiram royal family during the High Republic Era. His mother was the ruling queen of the planet Eiram in 382 BBY. That year, after a chance meeting, he and Princess Xiri A'lbaran of E'ronoh agreed to marry in the hopes of bringing peace to their planets, which had been at war for five years. However, that peace was destroyed at the Battle of Jedha, leaving the two to deal with the aftermath. After a diplomatic mission to speak with the Path of the Open Hand cult on Dalna turned into an extensive battle against them and the Jedi, he and A'lbaran managed to escape the planet and the battle. The two, with the help of Supreme Chancellor Orlen Mollo, then united their planets against the Path and turned the tide of the battle in the Jedi's favor, all while bringing lasting peace to their worlds.
Phan-tu was born into a poor family on the Outer Rim planet Eiram around 407 BBY. After his mother died in a storm, he was adopted into the Eiram royal family by Queen Adrialla.
In 382 BBY, during the Eiram and E'ronoh War, Xiri A'lbaran, the daughter of the ruling Monarch of E'ronoh, crashed into Erasmus Capital City's Rayes Canal on Eiram, but Phan-tu saved her from drowning. In order to end the Forever War, the two heirs decided to get married.
After both worlds decided to go through with the marriage, Zenn traveled to E'ronoh with A'lbaran, Jedi Knight Gella Nattai, and Axel Greylark. As they passed through the scattered towns and rough surface of the rocky planet, they encountered obstacles from the populace and assassins. Once they returned to the capital city of E'ronoh, Zenn prepared himself for the wedding and left for Eiram with Greylark.
When they reached Erasmus Capital City, Zenn investigated a presumably shut down biological research site with Greylark. Using his status to get in deeper in the facility. Zenn found out that that the facility was producing high amounts of poison, derived from a deadly Eirami scorpion. Greylark was stung by the arachnid, and sent to receive medical attention. Zenn then confronted his mother, who told him production of the poison was stopped, but urged him to keep the poison as a safeguard against any new enemies the world may face. A'lbaran concurred with the Queen of Eiram, and the poison was kept secret from the Galactic Republic and Jedi Order. However, Greylark attempted to destroy the poison and prevent it from falling into the hands of the Path of the Open Hand by flooding the city, revealing its existence.
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- Star Wars: The High Republic Character Encyclopedia