Cypros .

the daughter of Antipater by Cypros was Cypros, whom Alexas Selcias, the son of Alexas, married; they had a daughter, Cypros... Josephus: Antiquities of the Jews XVIII Chapter 5 .http://religiousstudies.uncc.edu/people/jtabor/john.html

As far as I can see, this means that Salome I's son by her 3rd husband, married her granddaughter by her 2nd husband.

Hmmm those Herodians & their interbreeding!

So:

Salome [Herod the Great's older sister] marries secondly Costobarus;

& their granddaughter, Cypros, marries
Alexas ii, [Salome I's son by her 3rd husband, Alexas i ]

[Sharon Doubell July 2013]

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http://en.wikipedia.org/wiki/Robert_Eisenman#Paul_as_an_Herodian