History of the 2nd person pronouns:

I. Tu for singular, vos for plural: vos as a singular referecne only to the emperor (4C)

II. Power figure extension from the emperor to others (12C~14C): non-reciprocal power semantics developed

III. Reciprocal V among equals in the upper class: V pronoun as a marker of elegance

• Upper class: reciprocal V (connote a speaker of high status)
• Lower class: reciprocal T

=> Non-reciprocal T-V, reciprocal V and reciprocal T

IV. Two dimensional system:

• Developed the solidarity dimension
• V form linked with differences: T of intimacy and Vof formality

V. One dimensional system: symmetrical solidarity attributes