Gandalf
Gandalf is a protagonist in J. R. R. Tolkien's novels "The Hobbit" and "The Lord of the Rings". He is a wizard, one of the "Istari" order, and the leader of the Fellowship of the Ring. Tolkien took the name "Gandalf" from the Old Norse "Catalogue of Dwarves" ("Dvergatal") in the "Völuspá". 
Gandalf
As a wizard and the bearer of a Ring of Power, Gandalf has great power, but works mostly by encouraging and persuading. He sets out as Gandalf the Grey, possessing great knowledge, and travelling continually, always focused on the mission to counter the Dark Lord Sauron. He is associated with fire, his ring being Narya, the Ring of Fire, and he both delights in fireworks to entertain the hobbits of the Shire, and in great need uses fire as a weapon. As one of the Maiar he is an immortal spirit, but being in a physical body on Middle-earth, he can be killed in battle, as he is by the Balrog from Moria. He is sent back to Middle-earth to complete his mission, now as Gandalf the White and leader of the Istari.
The Lord of the Rings: Journey to Rivendell
The Lord of the Rings: Journey to Rivendell was a video game scheduled to be released in the winter of 1983. Parker Brothers was set to publish it, and advertised it in their 1982 and 1983 catalogues as a game that would be released on the Atari 2600 and Atari Home Computer. The game was originally advertised under the name "Lord of the Rings", and in one case as "The Lord of the Rings I". It was described as an adventure of getting Frodo from the Shire to the door at Moria, a description which was later changed in the 1983 Parker Brothers Video Games catalogue to have Rivendell as the adventures end point instead. The same catalogue was first time the game was ever referred to as "The Lord of the Rings: Journey to Rivendell", and was the last advertisement the game ever received. The game was never released, and it was believed that little or no work was done on the game's coding. Almost twenty years after "The Lord of the Rings: Journey to Rivendell" was first announced, in the weeks leading up to the much anticipated release of the , a former Parker Brothers employee gave a prototype of the game to the operator of the AtariAge website. Surprisingly, the game was quite complex and seemed to be complete.
The Lord of the Rings: Journey to Rivendell
The game's objective is to travel as Frodo from the Shire to Rivendell while avoiding The Black Riders. If Frodo is caught by The Black Riders, he will be sent backwards from Rivendell and will be wounded. If Frodo is wounded too many times, or fails to reach Rivendell within 7 days, the game ends. As time passes the Nazgûl become faster and harder for Frodo to avoid, especially at night. Frodo can receive helpful bonuses, such as faster movement, by exploring and finding other characters from The Lord of the Rings. The other characters in the game are assumed to be Sam Gamgee, Aragorn, Gandalf, Tom Bombadil, and Glorfindel, though due to the low resolution of the Atari 2600 and the lack of an official reference manual, the identities of some of the game characters are debated by players. The game's Glorfindel and Tom Bombadil characters are often interpreted as Legolas and Gimli respectively.

Question: What order is the wizard in  Lord of the Rings: Journey to Rivendell part of?
Answer: Istari