All the prehistoric Manifestations were sent by Baha’u’llah

One of the title that Baha’u’llah gave to himself is the “Ancient Beauty”.

Another similar title is the “Ancient Tree” or the “Lote Tree”.

Baha’is also exaggerate the station of Baha’u’llah:

“…Bahá’u’lláh is the greatest Manifestation to yet appear, the One Who consummates the Revelation of Moses; He was the One Moses conversed with in the Burning Bush. In other words Bahá’u’lláh identifies the glory of the Godhead on that occasion with Himself…”

(From a letter written on behalf of Shoghi Effendi to an individual believer, October 19, 1947)

According to Baha’u’llah, he is the sender of the Messengers and revealer of all divine books.

“The Sender of the Messengers and the Revealer of the Books is Our station.”

(Stories of Baha’u’llah, Compiled by Ali-Akbar Furutan, George Ronald, Oxford, 1986, pp. 74–5)

Baha’is believe that all the prehistoric Manifestations were sent by Baha’u’llah.

Another Baha’i belief is that Baha’u’llah reveals “himself” only once every 500,000 years:

“This is the Revelation (Manifestation) that manifests itself (His own Self) every 500,000 years time only once. Moreover, we unveiled the cover and we lifted the veil. Blessed is the man that recognized (‘arif) the purpose of God. In his recognition (‘irafah) has rejoiced in his heart and been made firm in the cause such that he cannot be made to stumble by the entire creation. Verily We unveiled in this Tablet a secret wrapt in secrets. This Revelation We have concealed that which is the Hidden lest the tumult of the wicked rise.”

(https://www.hajir.org/excerpt-of-tablet-by-bahaullah-on-500000-years/)