Tripolis minted Roman coins, radiate "antoniniani" and a few aurei, for a limited time during the reigns from Aurelian (AD 270-275) through Diocletian and Maximian (284-305). The mint was probably closed about 286. The Tripolis coins of Aurelian and Tacitus are not clearly mintmarked, but after Tacitus, Tripolis coins are marked "TR" in the reverse field. The mint city is normally identified with the Tripolis south of Antioch (lower right on the map). However, one scholar, F. Redö, argued the coins were minted at a different Tripolis (in Phrygia, in Asia Minor, center left on his map reproduced here) and argues that it was also the city of the enigmatic mint with mintmark "SPQR" in the exergue under Gallienus and Claudius II.
    I think the mint is the Tripolis south of Antioch. I list coins according to RIC which first assigns coins to Tripolis under Aurelian. This site lists only antoniniani, not aurei.

References
Roman Imperial Coinage, volume V, part I, by Percy H. Webb, 1927 and volume V, part II, by Percy H. Webb, 1933. Spink & Son, London. (RIC)
D'Aurelien a Florien (270-276 apres J.-C.) by Sylviane Estiot (Estiot), Biliotheque National de France, Monnaies de l'Empire Romain, XII.1.  The new (2004) standard reference for coins of Aurelian, Tacitus, and Florian.  2004 in two volumes.
Aureliano, volume II.1, Ripostiglio della Venera Nuovo Catalogo Illustrato, by Sylvane Estiot (Est) . 1995.
"The history of the SPQR mint," by F. Redö, in Mitteilungen des Archäolgischen Instituts der Ungarnischen Akademie der Wissenschaften 12/13 1982/1983, Budapest, pages 85-111.
"Analyses de Series Atypiques" by J. P. Callu, Cl. Brenot, and J. N. Barrandon, in Numismatica e Antichita Classiche, VIII, 1979, pages 241-254.
"The alloy of the 'XI' coins of Tacitus" by Warren Esty, Nancy Equall, and Richard Smith, in Numismatic Chronicle, 1993, pages 97-226.
Roman Imperial Coins in the Hunter Coin Cabinet, volume IV, by Anne Robertson, 19878, Oxford University Press.  (Hunter)
Ripostiglio della Venera Nuovo Catalogo Illustrato, Aureliano, volume II/1, by Sylviane Estiot, 1995

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Format of each entry:
Obverse legend

RESTITVT ORBIS	RIC#389, p.309. "C" Estiot emission 3-5, pages 438-9. Spring 274 - end of 274. Plates 45-6, 1374-1393 Est 10827-9. Hunter --	Woman presenting wreath to emperor * in middle field KA in exergue
SOLI INVICTO	RIC#390, p.309. Estiot emission 1-2, page 438. Plate 45, 1368 (nothing in ex.) 1371 (KA in ex.) Est 10826. Hunter 34.116-7.	Sol stg l, r hand raised, l holding globe; at foot to l, captive. * in left field, KA in exergue. Obverse bust left on the 2 pieces illustrated in Hunter 34.116&117 Hunter:  2 photos of #390  (gF, wk aVF)
SOLI INVICTO	RIC#390, p.309 Estiot emission 1-2, page 438. Plate 45, 1367 (nothing in ex.). 1369- 1370 and 1372-1373 (KA in ex.).	Same as above, but bust right. Both have the same RIC number. I list them here separately as distinct collectable types.

PROVIDENTIA DEORVM (with PF in obverse legend)	Not in RIC. Estiot emission 1, Nov.-Dec. 275, page 258. Plate 64, 1838-1840	Emperor standing r holding scepter, receiving globe from Jupiter stg. l, holding scepter * over dot over KA, or * over KA
PROVIDENTIA DEORVM (same type as above but without PF, as are the following issues)	Not in RIC. Estiot emission 1, Nov.-Dec. 275, page 258. Plate 64, 1839-1841	Emperor standing r holding scepter, receiving globe from Jupiter stg. l, holding scepter * over dot over KA, or * over KA
CLEMENTIA TEMP	RIC#213, p.348 KA variety Estiot emission 2 Jan.- June 276 Plate 64, 1845	Emperor stg r holding scepter, receiving globe from Jupiter stg. l, holding scepter * over KA	no image [See Diocletian 328 below for the reverse type.]
CLEMENTIA TEMP	RIC#213, p.348 IA variety Estiot emission 2 Jan.- June 276 Plate 64, 1848	Emperor stg r holding scepter, receiving globe from Jupiter stg. l, holding scepter * over IA	no image, same type as previous.
CLEMENTIA TEMP	RIC#214 KA variety Estiot emission 2 Jan.- June 276 Plate 64, 1842-1844	Mars stg. or walking l, holding olive branch and spear and shield.  "R"  * in field left, KA in exergue
CLEMENTIA TEMP	RIC#214 IA  variety Plate X.154 "double anoninianus" Estiot, emission 2, Jan.- June 276 Plate 64, 1846-1847	Mars stg. or walking l, holding olive branch and spear and shield.  "R"  * in field left, IA in exergue IA coins are slightly larger in diameter than KA coins.  K is 20 in Greek] and "10 parts copper and 1 of silver" [I is 10 in Greek]. Therefore the very rare "IA" coins probably indicate a short-lived and ill-fated coin reform. They certainly would have been regarded as different by the issuer and users, and deserve two different reference numbers.

CLEMENTIA TEMP (sometimes followed by a dot, as on this example) IMP C M AVR PROBVS PF AVG	#927 p.121 plate V, 15 Hunter 353-354	Emp. stg. r holding scepter rec. globe from Jupiter stg l, holding scepter. Wreath in upper middle field. XXI in exergue on this example.  Other mintmarks include * in lower middle field above XXI,  and nothing, crescent, or T above KA in exergue ("T" for "Tripolis" according to Carson, Principate, #1034) [The key difference between #927 and #928 is the obverse legend, not the mintmark]
CLEMENTIA TEMP IMP C M AVR PROBVS AVG	#928 p.121 plate V, 16 Hunter 349-350	Emp. stg. r holding (eagle-tipped) scepter rec. globe from Jupiter stg l, holding scepter. Crescent in lower middle field and KA in exergue on this example. Other mintmarks include nothing, T, or * above KA.

VIRTVS AVGG (sometimes followed by a dot)	#128, p.150 Hunter --	Emperor standing right, holding sceptre, receiving globe from Jupiter (or Carinus) standing left, holding sceptre. * in upper field, TR in lower field, XXI in exergue.
DIVO CARO AVG /CONSECRATIO	#129, p. 150 Hunter --	eagle standing or looking left T to left, R to right XXI in exergue	no image
DIVO CARO AVG /CONSECRATIO	not in RIC (seen in trade)	altar, with garland, T to left, R to right XXI in exergue.

VIRTVS AVGG IMP C M AVR NVMERIANVS NOB C	#380, p.191, as Caesar Hunter 16 plate 51.16 (worn aVF)	Emperor standing right, holding sceptre, receiving globe from Jupiter (or Carinus) standing left, holding sceptre . * in upper field, TR in lower field, XXI in exergue.
VIRTVS AVGG IMP C M AVR NVMERIANVS PF AVG	#470, p.202, as Augustus	Emperor standing right, holding sceptre, receiving globe from Jupiter (or Carinus) standing left, holding sceptre . * in upper field, TR in lower field, XXI in exergue.

IOV ET HERCV CONSER AVGG [note: two G's]	#327 p.257	Jupiter standing right holding globe and sceptre, facing  Hercules standing left, holding Victory, club, as lion's skin XXI with palm left ro right in exergue	No small image.  Large image. [see Maximian 624 for the type (below)]
IOVI CONSERVATORI AVG [note:  one "G"]	#328 Hunter 75, plate 54.75 (Fine)	Emperor standing right, holding sceptre, receiving Victory on glove from Jupiter standing let, holding sceptre. XXI in exergue
IOVI CONSERVATORI AVGG [note: two G's]	#329	Emperor standing right, holding sceptre, receiving Victory on glove from Jupiter standing let, holding sceptre. <palm>XXI in exergue [The object held by the emperor is described by RIC as a "sceptre", but this may be the same object described by RIC and below as a "parazonium" (a short sword worn at the waist) under Maximian #626.]
IOVI CONSERVATORI AVG [note:  one "G"]	#330	Victory r holding palm, presenting wreath to emp holding globe and scepter XXI in exergue
IOVI CONSERVATORI AVGG	#331	Victory r holding palm, presenting wreath to emp holding globe and scepter XXI<palm> in exergue
VICTORIA AVG	#332	Victory r holding palm, presenting wreath to emp holding globe and scepter XXI in exergue	no image [See the next type for the reverse type.]
VICTORIA AVG [same as above except PF omitted in the obverse legend]	#333	Victory r holding palm, presenting wreath to emp holding globe and scepter XXI in exergue

IOV ET HERCV CONSER AVGG (as Diocletian 327)	#624, p.294 Hunter 62, 63, plate 56.63 (EF, sl. o/c)	Emp stg r holding globe and scepter, facing Hercules stg l holding Victory, club and lion's skin XXI<palm> in exergue or <palm>XXI
IOVI CONSERVATORI AVGG (as Diocletian 331)	#625, p.295	Victory walking right holding palm, presenting wreath to Jupiter left holding globe and scepter XXI<palm> in exergue
IOVI CONSERVATORI AVGG (as Diocletian 329)	#626. p.295	Emperor standing right, holding parazonium, receiving Victory on globe from Jupiter. XXI or <palm>XXI or XXI<palm> in exergue. [This may be the same type as Diocletian 329, with the "sceptre" there called a "parazonium" (a short sword worn at the waist) here.]