In Acts 3:11 and 5:13 Luke reports Peter regularly taught at Solomon’s Portico. The word στοά (stoa) is often translated “colonnade,” columned- porch, usually enclosed on one side covered with a roof. According to Josephus, Solomon’s Portico was a double-columned porch on the east side of the Temple near the court of the Gentiles. It was about 23 feet wide (15 cubits) and the columns were about 40 feet tall (25 cubits). Josephus claimed they were white marble with cedar-panels for a ceiling (Antiq. 15.11.3-5, §391-420; JW 5.5.1 §184-185). Josephus may have exaggerated on the marble; Ehud Netzer suggests they were stucco over stone drums, based on columns found at Masada (Netzer, 165). In either case the Portico would have been impressive, although not as monumental as the Royal Colonnade at the southern end of the Temple Mount.
Most Greek temples had porches to provide shelter for people gathering to worship. Keener points out a portico would one way a city could display wealth, although often they were built through the generosity of a benefactor’s gift (1:1074). In this case, Herod the Great likely rebuilt an existing colonnade from the Hasmonean temple. People assumed the area had been a part of Solomon’s original temple, as the name indicates. But nothing of Solomon’s Temple survived the destruction of the city in 586 B.C., just as nothing remains of Solomon’s Portico today.
The Herodians spent a great deal of money on the Temple courts in order to demonstrate their wealth and power. Since Jerusalem had only one God, all funds could be spent improving the buildings around the Temple. Solomon’s Portico was therefore a beautiful public area for Jewish people to gather in sight of the Temple.
Why did Peter and the other disciples return to this location? On the one hand, it is a likely location for teachers to gather with their disciples to discuss the Scripture. According to John 10:23 Jesus taught his disciples there, so Peter and the disciples are continuing the practice of Jesus by gathering on the Temple Mount. Perhaps that is the reason Jesus went there – it was simply a great place to find religiously inclined people!
Bibliography. Netzer, Ehud. Herod the Builder (Grand Rapids, Mich.: Baker 2006); Smith, Robert W. “Solomon’s Portico (Place),” ABD 6:113.