Ancient coin sites emphasizing a particular emperor
This page has two categories of sites. 1) General sites with links to pages of coins of particular emperors, and 2) Sites limited to particular emperors.
Wildwinds.com is one very popular site.
Large sale sites can be useful for identifying coins.
MA-Shops have many ancient coins and good search engines. But they do not attempt to teach you anything except what coins cost.
"Roman Imperial Coins - Free online resource for collectors": http://www.ancientcoins.ca/RIC/index.htm has pages for each emperor, organized by RIC number.
"Wikimedia Commons" ( https://commons.wikimedia.org/wiki/Category:Roman_coins_by_emperor ) has photographs of coins of the emperors, without any commentary, and not identified or organized [These pages have images, but are not assembled with love and thus do not have the appeal of collectors' pages.] e.g. Coins of Augustus , Coins of Tiberius , Coins of Caligula , Coins of Claudius , Coins of Nero , Coins of Galba , Coins of Otho, Coins of Vitellius , and many others.
Particular: These links are to sites created by individuals who love coins and want to teach you something about a particular emperor or at least show you their collection.
Photos (only) of sestertii of the emperor Nero. [Not a single collection. Just photos of excellent coins, not even identified.]
A collection of denarii of Otho. [An extensive collection from a man who studied (not just collected) denarii of Otho. Some have comments.]
Domitian (81-96 AD) [Very high grade coins with numerous rare pieces, each with a few lines of commentary.]
A collection of denarii of Domitian. [Pictures with coins identified, but almost no commentary]
The Flavians (Vespasian, Titus, and Domitian) [An article with quite a bit of information in addition to coin photographs.]
David Atherton's collection of Flavian silver coins [Each coin is well-illustated with a lot of commentary about its interest.]
Trajan (AD 98-117) sestertii (amazingly complete, with denarii and other denominations too) [Includes a brief biography, a discussion of his portraits, and commentary on many interesting types.]
Another collector (Tom Buggey) emphasizes Trajan, but also with Greek coins and coins of other civiliations. [Coins well-identified, without much commentary.]
Hadrian (AD 117-138) on coins of Roman Egypt (not "imperial" coins) [A selection identifed and described without commentary.]
Hadrian (on Beast's site) [Different bust styles considered and then many coins identifed, some with commentary.]
The "travel series" of Hadrian [An comprehensive site with all types illustrated, often with numerous examples from auctions with their prices rezlized given.]
Barry Murphy's collection [now sold off] of Septimus Severus and his family (Caracalla, Julia Domna, Geta, and Plautilla). High-quality coins well-organized by mint, but not a lot of commentary.
Doug Smith has a lot on Septimius Severus (AD 193-211) and his wife Julia Domna among his many pages. Click his links (not just the one page I linked to). [Extensive and entertaining commentary.]
A small site on portraits of Geta, son of Septimius Severus [His portrait styles considered with extensive commentary, but only four coins.]
Coins of Geta and Caracalla [Coins from each year with some commentary.]
A site on Elagabalus (AD 218-222) [Numerous coins with commentary and links.]
Another site on Elagabalus (AD 218-222) [Very many images identified inlcuding many Roman provincial coins of Elagabalus.]
Maximinus Thrax, the Giant (AD 235-238) [His three different portraits and all the types, with commentary.]
Gordian III (AD 238-244) The collection of Michael Mihalka. It is through for types of denarii and also has around 385 coins from over 90 provincial cities.
Gordian III (AD 238-244) An extensive colletion with commentary and a biography page. Organized by issue which helps with dating.
Jim Shaffer's site on Philip "the Arab" (244-249) and his family. [Many imperial coins, a separate page on bust types, plus many provincial types.]
Antoninani of Philip and his family from the Antioch mint, by Marchal Thibaut.
Doug Smith has a terrific overview of the coins of Philip and his family.
The "DIVI series" of previous emperors honored by Trajan Decius.
Trajan Decius, Trebonianus Gallus (251-253) and their families and coins of Aemilian (253) ["Four Bad Years, 249-253". Many pages.]
The Gallic Empire (Postumus, Laelianus, Marius, Victorinus, Domitianus II, Tetricus I, Tetricus II) [A complete list of types, most illustrated.]
Jacquier (a firm in Germany) had an auction with 200 coins of Postumus (with real prices realized)
Gallienus (AD 253-268) [A large identified collection.]
Over 1000 types of Gallienus coins [Identified by RIC, Göbl, and Sear]
"zoo" coins of Gallienus [Historical background and numbers of each type in Cunetio (a large hoard), but not illustrated]
Here is an on-line update to RIC, the main academic complete database on coins of Claudius II, Quintillus, Aurelian, Tacitus, and Florian (268-276)
Tom Ross has a site on Aurelian. (AD 270-275) [An extensive collection, arranged by mint.]
Another site on Aurelian (270-275) [Coins and biography, including sections on: The rise to power; The Moneyer's Revolt; The Coinage Reform and finally The Eastern Coinage.]
Coins of Probus (AD 276-282) [A very extensive site. Don't miss the page on bust types.]
Coins of Probus with coded mintmarks [An article by Chip Scoppa with lots of explanation.]
Carus, Carinus, and Numerian (282-285) [An extensive site with lots of commentary, originally in Dutch, but google can translate it for you.]
A collection of Carausius in CNG e-auction 204.
Coins of the tetrarchy from London (Diocletian. Maximian, Constantius I, Galerius)
Another site on coins of London (296-325) [Lots of commentary on chronology and legends, but not much emphasis on photographs.]
A pdf of a highly detailed academic article on the coinage of Allectus
Coins of Constantine the Great (306-337) by Victor Clark. [An extensive site. Lots of commentary and photos. There are many pages to explore.]
Glenn Simonelli's collection of AE coins of Constantine the Great [A hundred AE coins.]
The story of how Constantine and Maximinus II got the title FIL AVG seen on coins. [An article, not just photographs.]
The story of Crispus, illustrated with coins.
The story of the House of Constantine by Reid Goldsborough [An illustrated article.]
FEL TEMP REPARATIO coins of Constans, Constantius II, Gallus, Magnentius, and Decentius.
Helvetica's extensive site on FEL TEMP REPARATIO coins
Coins of emperor Vetranio (350) [All six copper types listed and illustrated.]
Coins of emperor Jovian (363-364) [All four copper types listed and illustrated.]
All AE types on coins of Valentinian through Theodosius II (364-450) [A very large site with many pages, including type sets for emperors.]
Emperors on coins (without much text)
"Roman Numismatic Gallery" lots of nice images.
De Imperatoribus Romanis is an on-line encyclopedia of the Roman emperors.
Go to the main Table of Contents page for this site.