Early in the 3d century BCE, during the period of Pyrrhus (297-272 BCE), the Hiera Oikia low wall was replaced by a taller, more ornate one. It included Ionic columns on three sides, and this is the place where Pyrrhus dedicated the Roman shields he captured after his victory at Heraclean in Italy in 280 BCE.
After the Aetolians burned the sanctuary (Polybius indicates that they demolished the Hiera Oikia instead of burning it), the Macedonians rebuilt it even larger. The smaller temple was replaced with a larger one at that time, and enclosing wall was was similarly enlarged.