The three plays together form an organic whole.
In ‘The Guardian of the Threshold’ the following persons and beings appear:
I. Representatives of the Element of Spirit:
- 1. Benedictus. Leader of the Temple of the Sun and the teacher of a number of people who appear in ‘The Guardian of the Threshold.’
- 2. Hilary True-to-God, Grand Master of the Mystic League, represented in a former incarnation in ‘The Soul’s Probation’ as the Grand Master of a Mystic Brotherhood.
- 3. Johannes Thomasius, a pupil of Benedictus, sometimes called Johannes and sometimes Thomasius.
II. Representatives of the Element of Sacrifice:
- 4. Magnus Bellicosus, Preceptor of the Mystic League, known as Germanus in ‘The Portal of Initiation.’
- 5. Albertus Torquatus, Master of the Ceremonies in the Mystic League, known as Theodosius in ‘The Portal of Initiation.’
- 6. Professor Capesius.
III. Representatives of the Element of Will:
- 7. Frederick Trustworthy, Master of the Ceremonies in the Mystic League. The Reincarnation of the Second Master of the Ceremonies of the Spirit-Brotherhood in ‘The Soul’s Probation’; and known as ‘Romanus’ in ‘The Portal of Initiation.’
- 8. Theodora, a Seeress, in whom the Element of Will is changed into a simple gift of prophecy.
- 9. Doctor Strader.