noun
Archaic directional noun; in modern Japanese, あちら or あっち are used instead.
古典では「あなたがた」が方角を指すことがある。
In classical texts, あなたがた can refer to a direction.
pronoun
Archaic third-person pronoun; now replaced by あの人, 彼, 彼女, etc.
古い文では「あなたがた」が「あの人」の意味で使われる。
In old writing, あなたがた is used to mean 'that person'.
The historical derivation is uncertain; the kanji 彼方方 literally suggest 'that direction/person', but the word is now obsolete.