The Three Principals

• First Principal (Z – Zerubbabel): The leader and chief officer of the Chapter, acting as the president/master.
• Second Principal (H – Haggai): The second in command, who assists in running and closing the Chapter.
• Third Principal (J – Joshua): The third in command, who assists the Principals and oversees the admission of visitors. 

Scribes and Treasurer

• Scribe E (Ezra): The secretary of the Chapter, handling administration, records, and correspondence.
• Scribe N (Nehemiah): Works alongside the Janitor to maintain order and secure the Chapter against intruders.
• Treasurer: The financial officer managing the Chapter’s funds. 

Sojourners

• Principal Sojourner: The leader of the sojourners who guides candidates through the central ceremonies.
• First and Second Assistant Sojourners: Assist the Principal Sojourner in the ritual work.

Other Chapter Officers

• Director of Ceremonies (DC): Manages the layout, movement, and protocol of the ritual.
• Almoner: Looks after the welfare, sickness, and charitable support of members and their families.
• Charity Steward: Coordinates donations to Masonic and non-Masonic charities.
• Organist / Music Maker: Provides musical accompaniment for ceremonies.
• Janitor: Guards the door from the outside and keeps the sanctuary secure.
• Stewards & Assistant Directors of Ceremonies: Support general operations and dining.

What the Principals Wear

• First Principal (Zerubbabel): Wears a scarlet robe (symbolizing kingly dignity) and carries a sceptre with a crown.
• Second Principal (Haggai): Wears a purple robe (symbolizing high station) and carries a sceptre with the All-Seeing Eye.
• Third Principal (Joshua): Wears a blue robe (symbolizing holiness/priesthood) along with a breastplate and mitre.
• Principals’ Regalia: All three Principals wear the specific Royal Arch Principals’ Apron and Sash (trimmed with red and blue moiré pattern and a triple Tau). 

Who Wears the Surplice in the UK Royal Arch?

• Sojourners and Scribes: A plain white ceremonial surplice is worn by officers such as the Sojourners (1st, 2nd, and 3rd) and Scribes (such as Scribe Ezra) during specific Royal Arch rituals and exaltation ceremonies.
• Candidates: During specific parts of the exaltation ceremony in some workings, a candidate may also wear a surplice over his attire.