Chalcis subsequently became a member of both the Delian Leagues.
From the en.wikipedia.org
Chalcis entered a long decline while the islands in the Cyclades that Eretria controlled earlier seem to have become independent.
From the en.wikipedia.org
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Type genus of the Chalcididae
Chalcis (/u02C8ku00E6lsu1D7Bs/; Ancient Greek & Katharevousa: u03A7u03B1u03BBu03BAu03AFu03C2, Chalku00EDs) or Chalkida (Modern Greek: u03A7u03B1u03BBu03BAu03AFu03B4u03B1, ) is the chief town of the island of Euboea in Greece, situated on the Euripus Strait at its narrowest point. The name is preserved from antiquity and is derived from the Greek u03C7u03B1u03BBu03BAu03CCu03C2 (copper, bronze), though there is no trace of any mines in the area...
Chalcis was an ancient city in Syria. Syrian Chalcis was the birthplace of 3rd century AD Neoplatonist philosopher Iamblichus.