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also called Porrima or Prorsa (Fasti By Ovid), together with Postvorta, are described either as the two sisters or companions of the Roman goddess Carmenta.
It seems to be clear, from the manner in which Macrobius
speaks of Antevorta and Postvorta, that originally they were only
two attributes of the one goddess Carmenta, the former describing her knowledge
of the future and the latter that of the past, analogous to the
two-headed Janus. But that in later times Antevorta and Postvorta
were regarded as two distinct beings, companions of Carmenta, or
as two Carmentae, is expressly said by Varro, Ovid, and
Macrobius. According to Varro, who also says, that they had two
altars at Rome, they were invoked by pregnant women, to avert the
dangers of child-birth.