This page describes the logic behind attributions of swords signed 'Ichi' (一) bearing a generic attribution '(such and such school) Ichimonji' which is used in Nihonto Club databases.
Assuming that the particular Ichimonji school/group is known as well as estimated era, zaimei 'Ichi' swords will be attributed to specific smith records using the table below.
| School |
Period |
Years |
Attribution |
| Ko-Ichimonji |
Teiō (1222-1224) |
1222-1224 |
ICH7 |
| Ko-Ichimonji |
other |
1184-1243 |
ICH6 |
| Fukuoka Ichimonji |
Kangen (1243-1247) to Hōji (1247-1249) |
1243-1249 |
ICH8 |
| Fukuoka Ichimonji |
Kenchō (1249-1256) to Bunō (1260-1261) |
1249-1261 |
ICH9 |
| Fukuoka Ichimonji |
Kōchō (1261-1264) to Kōan (1278-1288) |
1261-1288 |
ICH11 |
| Fukuoka Ichimonji |
uncertain |
|
ICH9 |
| Yoshioka Ichimonji |
Shoō (1288-1293) to Shokei (1332-1334) |
1288-1334 |
ICH12 |
| Yoshioka Ichimonji |
Kenmu (1334-1338) ND to Ryakuō (1338-1342) |
1334-1342 |
ICH15 |
| Yoshioka Ichimonji |
Kōei (1342-1345) ND to Kōan (1361-1362) |
1342-1362 |
ICH17 |
| Yoshioka Ichimonji |
Teiji (1362-1368) ND to Meitoku (1390-1394) |
1362-1394 |
ICH18 |
| Yoshioka Ichimonji |
uncertain |
|
ICH12 |
| Shōchū/Iwato Ichimonji |
any |
|
ICH13 |
| Katayama Ichimonji |
any |
|
ICH5 |
|
Ōei (1394-1428) |
1394-1428 |
ICH19 |
