Actually there was seven Pausanias:
1) Pausanias (the Periheget), 2nd cent. CE
2) Pausanias (the Spartan General), 5th cent. BCE
3) Pausanias (the Spartan
King), 5th-4th cent. BCE
4) Pausanias (the Apollonian), 4th cent. BCE
5) Pausanias (the Sophist), 2nd cent. CE
6) Pausanias (the Lexicographer)
7) Pausanias (the Herakletist)
Here we talking about Pausanias Periheget, the famous geographer of the 2nd cent. CE and the third book "Lakonia" from his work "Description of Greece".
About Alexandra-Cassandra sanctuary at Amyclae: Paus. 3.19.6:
"Amyclae was laid waste by the Dorians, and since that time has remained a village; I found there a sanctuary and image of
Alexandra worth seeing.
Alexandra is said by the Amyclaeans to be
Cassandra, the daughter of
Priam. Here is also a statue of Clytaemnestra, together with what is supposed to be the tomb of
Agamemnon. The natives worship the Amyclaean god and
Dionysus, surnaming the latter, quite correctly I think, Psilax. For psila is Doric for wings, and wine uplifts men and lightens their spirit no less than wings do birds."
http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus:text:1999.01.0160&query=section%3D%23808
About name
Alexandra given to
Cassandra by people of Leuctra in Laconia: Paus. 3.26.5:
"Also a temple and statue have been erected to
Cassandra the daughter of
Priam, called
Alexandra by the natives. There are wooden images of
Apollo Carneius according to the same custom that prevails among the Lacedaemonians of Sparta. On the acropolis is a sanctuary and image of
Athena, and there is a temple and grove of
Eros in Leuctra. Water flows through the grove in winter-time, but the leaves which are shaken from the trees by the wind would not be carried away by the water even in flood."
http://www.perseus.tufts.edu/cgi-bin/ptext?lookup=Paus%2e+3%2e26%2e5