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The Belgae were a confederation of many tribs. During the Gaullic War they send 300,000 to help Vercingetorix, who(s besieged in Alesia. The Suessiones (Suessions, capital Noviodunum (Soissons)) were the leader of this confederation.
Tribs of this Confederation:

The most important:
*Suessiones (Suessions)*
Capital:Noviodunum (Soissons(France))
Client:
-Meldi (Meldes; capital: Latinum / Iatinum / Fixtinum (Meaux(France))
-Silvanecti / Sulbanecti / Ulmanecti (Silvanectes; capital: Ratumagus / Ῥατóμαγος (Hermes), puis Augustomagus (Senlis(France))
-Viromandui (Viromanduens; capital: ?)

*Bellovaci (Bellovaques)*
Capital: Bratuspantium (?)

*Ambiani (Ambiens)*
Capital: Samarobriva (Amiens(France))

*Atrebates (Atrébates)*
Capital: Nemetacon (Arras(France))

*Veliocassi (Véliocasses)*
Capital: Rotomagus (Rouen(France))

*Morini (Morins)*
Capital: Taruenna (Thérouanne(France))

*Nervi (Nerviens)*
Capital: Bagacum (Bavay(France))
Client:
-Pleumoxii
-Leuaci (Lévaques)
-Centrons
-Grudii
-Geidumni (Geidumnes)


*Menapii (Ménapiens)*
Capital: Castellum menapiorum (Cassel(France))

The other:
*Atuatuci (Atuatuques)*

*Caleti (Calètes)*

*Catuslogi (Catuslogues)*