Ancient & Roman

Ancient Greek & Roman Coins - http://dougsmith.ancients.info/

Ancient Imports - http://www.ancientimports.com/

Antoninianii from Antioch under the reign of Philip the Arab - http://marchal.thibaut.free.fr/e_index.htm

BeastCoins - http://www.beastcoins.com/

Classical Numismatics Discussion Board -  http://www.forumancientcoins.com/board/index.php

Classical Numismatic Group, Inc. - http://www.cngcoins.com/

Coins of the Roman Tetrarchs - http://www.tetrarchy.com/

Constantine the Great Coins - http://www.constantinethegreatcoins.com/

David R. Sear - http://www.davidrsear.com/

Gordian III - http://mihalkam.ancients.info/gordianiii.html

HELVETICA'S IDENTIFICATION HELP PAGE - http://www.catbikes.ch/coinstuff.htm

Historia: A collection of coins with their historical context - http://www.forumancientcoins.com/historia/

London Mint Coins: 296-325 AD - http://www.kenelks.co.uk/coins/london/londonmint.htm

M.G.M´S ROMAN COINS - http://www.romerskamynt.se/

ROMAN COINS OF THE LONDON MINT: 296-325 AD - http://jp29.org/

The Celetor - http://www.celator.com/

VCoins - http://www.vcoins.com/

Wildwinds - http://www.wildwinds.com/coins//

Sweden

Svenska mynt på nätet Forum - http://swedishcoins.net/forum/

Kungliga Myntkabinettet - http://www.myntkabinettet.se/

Numismatiska Forskningsgruppen - http://www.numismatiskaforskningsgruppen.su.se/

Svenska Numismatiska Föreningen - http://www.numismatik.se/index.php

Other links

ForgeryNetwork - http://www.forgerynetwork.com/

The Roman Empire - http://www.roman-empire.net/

Time Team - http://www.channel4.com/timeteam/