The Missionary in the Age of Empires II: The Conquerors expansion is a Spanishunique unit. It is the only unique unit that is created at the Monastery. Like its cousin, the Monk, the Missionary is capable of healing units as well as converting enemy units, but (unlike the Monk) the Missionary cannot pick up Relics. It can move quite fast, capable of keeping up with most cavalry units. Including several of these in a force of knights can considerably improve chances of winning a drawn-out battle. Missionaries also work well for converting the surviving villagers, buildings and units of a defeated enemy. They are affected by all Monk technologies. They only have 7 range, as opposed to 9 for a regular monk. Their healing rate is also decreased to half that of a monk.
Missionaries cost 100 Gold to train, the same as a Monk. Given its characteristics, the Missionary generally outperforms the Monk in most ways and so is the more desirable choice, especially during the mid-to end game where most of the Relics have been collected.