- "Taika (645-650)" /** (abbr.) */,
- "Hakuchi (650-671)" /** (abbr.) */,
- "Hakuhō (672-686)" /** (abbr.) */,
- "Shuchō (686-701)" /** (abbr.) */,
- "Taihō (701-704)" /** (abbr.) */,
- "Keiun (704-708)" /** (abbr.) */,
- "Wadō (708-715)" /** (abbr.) */,
- "Reiki (715-717)" /** (abbr.) */,
- "Yōrō (717-724)" /** (abbr.) */,
- "Jinki (724-729)" /** (abbr.) */,
- "Tempyō (729-749)" /** (abbr.) */,
- "Tempyō-kampō (749-749)" /** (abbr.) */,
- "Tempyō-shōhō (749-757)" /** (abbr.) */,
- "Tempyō-hōji (757-765)" /** (abbr.) */,
- "Temphō-jingo (765-767)" /** (abbr.) */,
- "Jingo-keiun (767-770)" /** (abbr.) */,
- "Hōki (770-780)" /** (abbr.) */,
- "Ten-ō (781-782)" /** (abbr.) */,
- "Enryaku (782-806)" /** (abbr.) */,
- "Daidō (806-810)" /** (abbr.) */,
- "Kōnin (810-824)" /** (abbr.) */,
- "Tenchō (824-834)" /** (abbr.) */,
- "Shōwa (834-848)" /** (abbr.) */,
- "Kajō (848-851)" /** (abbr.) */,
- "Ninju (851-854)" /** (abbr.) */,
- "Saiko (854-857)" /** (abbr.) */,
- "Tennan (857-859)" /** (abbr.) */,
- "Jōgan (859-877)" /** (abbr.) */,
- "Genkei (877-885)" /** (abbr.) */,
- "Ninna (885-889)" /** (abbr.) */,
- "Kampyō (889-898)" /** (abbr.) */,
- "Shōtai (898-901)" /** (abbr.) */,
- "Engi (901-923)" /** (abbr.) */,
- "Enchō (923-931)" /** (abbr.) */,
- "Shōhei (931-938)" /** (abbr.) */,
- "Tengyō (938-947)" /** (abbr.) */,
- "Tenryaku (947-957)" /** (abbr.) */,
- "Tentoku (957-961)" /** (abbr.) */,
- "Ōwa (961-964)" /** (abbr.) */,
- "Kōhō (964-968)" /** (abbr.) */,
- "Anna (968-970)" /** (abbr.) */,
- "Tenroku (970-973)" /** (abbr.) */,
- "Ten-en (973-976)" /** (abbr.) */,
- "Jōgen (976-978)" /** (abbr.) */,
- "Tengen (978-983)" /** (abbr.) */,
- "Eikan (983-985)" /** (abbr.) */,
- "Kanna (985-987)" /** (abbr.) */,
- "Ei-en (987-989)" /** (abbr.) */,
- "Eiso (989-990)" /** (abbr.) */,
- "Shōryaku (990-995)" /** (abbr.) */,
- "Chōtoku (995-999)" /** (abbr.) */,
- "Chōhō (999-1004)" /** (abbr.) */,
- "Kankō (1004-1012)" /** (abbr.) */,
- "Chōwa (1012-1017)" /** (abbr.) */,
- "Kannin (1017-1021)" /** (abbr.) */,
- "Jian (1021-1024)" /** (abbr.) */,
- "Manju (1024-1028)" /** (abbr.) */,
- "Chōgen (1028-1037)" /** (abbr.) */,
- "Chōryaku (1037-1040)" /** (abbr.) */,
- "Chōkyū (1040-1044)" /** (abbr.) */,
- "Kantoku (1044-1046)" /** (abbr.) */,
- "Eishō (1046-1053)" /** (abbr.) */,
- "Tengi (1053-1058)" /** (abbr.) */,
- "Kōhei (1058-1065)" /** (abbr.) */,
- "Jiryaku (1065-1069)" /** (abbr.) */,
- "Enkyū (1069-1074)" /** (abbr.) */,
- "Shōho (1074-1077)" /** (abbr.) */,
- "Shōryaku (1077-1081)" /** (abbr.) */,
- "Eiho (1081-1084)" /** (abbr.) */,
- "Ōtoku (1084-1087)" /** (abbr.) */,
- "Kanji (1087-1094)" /** (abbr.) */,
- "Kaho (1094-1096)" /** (abbr.) */,
- "Eichō (1096-1097)" /** (abbr.) */,
- "Shōtoku (1097-1099)" /** (abbr.) */,
- "Kōwa (1099-1104)" /** (abbr.) */,
- "Chōji (1104-1106)" /** (abbr.) */,
- "Kashō (1106-1108)" /** (abbr.) */,
- "Tennin (1108-1110)" /** (abbr.) */,
- "Ten-ei (1110-1113)" /** (abbr.) */,
- "Eikyū (1113-1118)" /** (abbr.) */,
- "Gen-ei (1118-1120)" /** (abbr.) */,
- "Hoan (1120-1124)" /** (abbr.) */,
- "Tenji (1124-1126)" /** (abbr.) */,
- "Daiji (1126-1131)" /** (abbr.) */,
- "Tenshō (1131-1132)" /** (abbr.) */,
- "Chōshō (1132-1135)" /** (abbr.) */,
- "Hoen (1135-1141)" /** (abbr.) */,
- "Eiji (1141-1142)" /** (abbr.) */,
- "Kōji (1142-1144)" /** (abbr.) */,
- "Tenyō (1144-1145)" /** (abbr.) */,
- "Kyūan (1145-1151)" /** (abbr.) */,
- "Ninpei (1151-1154)" /** (abbr.) */,
- "Kyūju (1154-1156)" /** (abbr.) */,
- "Hogen (1156-1159)" /** (abbr.) */,
- "Heiji (1159-1160)" /** (abbr.) */,
- "Eiryaku (1160-1161)" /** (abbr.) */,
- "Ōho (1161-1163)" /** (abbr.) */,
- "Chōkan (1163-1165)" /** (abbr.) */,
- "Eiman (1165-1166)" /** (abbr.) */,
- "Nin-an (1166-1169)" /** (abbr.) */,
- "Kaō (1169-1171)" /** (abbr.) */,
- "Shōan (1171-1175)" /** (abbr.) */,
- "Angen (1175-1177)" /** (abbr.) */,
- "Jishō (1177-1181)" /** (abbr.) */,
- "Yōwa (1181-1182)" /** (abbr.) */,
- "Juei (1182-1184)" /** (abbr.) */,
- "Genryuku (1184-1185)" /** (abbr.) */,
- "Bunji (1185-1190)" /** (abbr.) */,
- "Kenkyū (1190-1199)" /** (abbr.) */,
- "Shōji (1199-1201)" /** (abbr.) */,
- "Kennin (1201-1204)" /** (abbr.) */,
- "Genkyū (1204-1206)" /** (abbr.) */,
- "Ken-ei (1206-1207)" /** (abbr.) */,
- "Shōgen (1207-1211)" /** (abbr.) */,
- "Kenryaku (1211-1213)" /** (abbr.) */,
- "Kenpō (1213-1219)" /** (abbr.) */,
- "Shōkyū (1219-1222)" /** (abbr.) */,
- "Jōō (1222-1224)" /** (abbr.) */,
- "Gennin (1224-1225)" /** (abbr.) */,
- "Karoku (1225-1227)" /** (abbr.) */,
- "Antei (1227-1229)" /** (abbr.) */,
- "Kanki (1229-1232)" /** (abbr.) */,
- "Jōei (1232-1233)" /** (abbr.) */,
- "Tempuku (1233-1234)" /** (abbr.) */,
- "Bunryaku (1234-1235)" /** (abbr.) */,
- "Katei (1235-1238)" /** (abbr.) */,
- "Ryakunin (1238-1239)" /** (abbr.) */,
- "En-ō (1239-1240)" /** (abbr.) */,
- "Ninji (1240-1243)" /** (abbr.) */,
- "Kangen (1243-1247)" /** (abbr.) */,
- "Hōji (1247-1249)" /** (abbr.) */,
- "Kenchō (1249-1256)" /** (abbr.) */,
- "Kōgen (1256-1257)" /** (abbr.) */,
- "Shōka (1257-1259)" /** (abbr.) */,
- "Shōgen (1259-1260)" /** (abbr.) */,
- "Bun-ō (1260-1261)" /** (abbr.) */,
- "Kōchō (1261-1264)" /** (abbr.) */,
- "Bun-ei (1264-1275)" /** (abbr.) */,
- "Kenji (1275-1278)" /** (abbr.) */,
- "Kōan (1278-1288)" /** (abbr.) */,
- "Shōō (1288-1293)" /** (abbr.) */,
- "Einin (1293-1299)" /** (abbr.) */,
- "Shōan (1299-1302)" /** (abbr.) */,
- "Kengen (1302-1303)" /** (abbr.) */,
- "Kagen (1303-1306)" /** (abbr.) */,
- "Tokuji (1306-1308)" /** (abbr.) */,
- "Enkei (1308-1311)" /** (abbr.) */,
- "Ōchō (1311-1312)" /** (abbr.) */,
- "Shōwa (1312-1317)" /** (abbr.) */,
- "Bunpō (1317-1319)" /** (abbr.) */,
- "Genō (1319-1321)" /** (abbr.) */,
- "Genkyō (1321-1324)" /** (abbr.) */,
- "Shōchū (1324-1326)" /** (abbr.) */,
- "Kareki (1326-1329)" /** (abbr.) */,
- "Gentoku (1329-1331)" /** (abbr.) */,
- "Genkō (1331-1334)" /** (abbr.) */,
- "Kemmu (1334-1336)" /** (abbr.) */,
- "Engen (1336-1340)" /** (abbr.) */,
- "Kōkoku (1340-1346)" /** (abbr.) */,
- "Shōhei (1346-1370)" /** (abbr.) */,
- "Kentoku (1370-1372)" /** (abbr.) */,
- "Bunchũ (1372-1375)" /** (abbr.) */,
- "Tenju (1375-1379)" /** (abbr.) */,
- "Kōryaku (1379-1381)" /** (abbr.) */,
- "Kōwa (1381-1384)" /** (abbr.) */,
- "Genchũ (1384-1392)" /** (abbr.) */,
- "Meitoku (1384-1387)" /** (abbr.) */,
- "Kakei (1387-1389)" /** (abbr.) */,
- "Kōō (1389-1390)" /** (abbr.) */,
- "Meitoku (1390-1394)" /** (abbr.) */,
- "Ōei (1394-1428)" /** (abbr.) */,
- "Shōchō (1428-1429)" /** (abbr.) */,
- "Eikyō (1429-1441)" /** (abbr.) */,
- "Kakitsu (1441-1444)" /** (abbr.) */,
- "Bun-an (1444-1449)" /** (abbr.) */,
- "Hōtoku (1449-1452)" /** (abbr.) */,
- "Kyōtoku (1452-1455)" /** (abbr.) */,
- "Kōshō (1455-1457)" /** (abbr.) */,
- "Chōroku (1457-1460)" /** (abbr.) */,
- "Kanshō (1460-1466)" /** (abbr.) */,
- "Bunshō (1466-1467)" /** (abbr.) */,
- "Ōnin (1467-1469)" /** (abbr.) */,
- "Bunmei (1469-1487)" /** (abbr.) */,
- "Chōkyō (1487-1489)" /** (abbr.) */,
- "Entoku (1489-1492)" /** (abbr.) */,
- "Meiō (1492-1501)" /** (abbr.) */,
- "Bunki (1501-1504)" /** (abbr.) */,
- "Eishō (1504-1521)" /** (abbr.) */,
- "Taiei (1521-1528)" /** (abbr.) */,
- "Kyōroku (1528-1532)" /** (abbr.) */,
- "Tenmon (1532-1555)" /** (abbr.) */,
- "Kōji (1555-1558)" /** (abbr.) */,
- "Eiroku (1558-1570)" /** (abbr.) */,
- "Genki (1570-1573)" /** (abbr.) */,
- "Tenshō (1573-1592)" /** (abbr.) */,
- "Bunroku (1592-1596)" /** (abbr.) */,
- "Keichō (1596-1615)" /** (abbr.) */,
- "Genwa (1615-1624)" /** (abbr.) */,
- "Kan-ei (1624-1644)" /** (abbr.) */,
- "Shōho (1644-1648)" /** (abbr.) */,
- "Keian (1648-1652)" /** (abbr.) */,
- "Shōō (1652-1655)" /** (abbr.) */,
- "Meiryaku (1655-1658)" /** (abbr.) */,
- "Manji (1658-1661)" /** (abbr.) */,
- "Kanbun (1661-1673)" /** (abbr.) */,
- "Enpō (1673-1681)" /** (abbr.) */,
- "Tenwa (1681-1684)" /** (abbr.) */,
- "Jōkyō (1684-1688)" /** (abbr.) */,
- "Genroku (1688-1704)" /** (abbr.) */,
- "Hōei (1704-1711)" /** (abbr.) */,
- "Shōtoku (1711-1716)" /** (abbr.) */,
- "Kyōhō (1716-1736)" /** (abbr.) */,
- "Genbun (1736-1741)" /** (abbr.) */,
- "Kanpō (1741-1744)" /** (abbr.) */,
- "Enkyō (1744-1748)" /** (abbr.) */,
- "Kan-en (1748-1751)" /** (abbr.) */,
- "Hōryaku (1751-1764)" /** (abbr.) */,
- "Meiwa (1764-1772)" /** (abbr.) */,
- "An-ei (1772-1781)" /** (abbr.) */,
- "Tenmei (1781-1789)" /** (abbr.) */,
- "Kansei (1789-1801)" /** (abbr.) */,
- "Kyōwa (1801-1804)" /** (abbr.) */,
- "Bunka (1804-1818)" /** (abbr.) */,
- "Bunsei (1818-1830)" /** (abbr.) */,
- "Tenpō (1830-1844)" /** (abbr.) */,
- "Kōka (1844-1848)" /** (abbr.) */,
- "Kaei (1848-1854)" /** (abbr.) */,
- "Ansei (1854-1860)" /** (abbr.) */,
- "Man-en (1860-1861)" /** (abbr.) */,
- "Bunkyū (1861-1864)" /** (abbr.) */,
- "Genji (1864-1865)" /** (abbr.) */,
- "Keiō (1865-1868)" /** (abbr.) */,