Official rule text
61.13 Each game contains five stage I and five stage II public objective cards that the speaker places facedown near the victory point track during setup. a The speaker reveals two of the stage I objective cards during setup. All other objective cards remain facedown.
View official source
Source: Living Rules Reference and FAQ - Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 61.13