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The Antiqua maneria (ancient manors), also known as assessionable manors, were the original 17 manorialism belonging to the Earldom of Cornwall.
After March 1337, these manors were transferred to the new Duchy of Cornwall created by King Edward III to provide financial support to his son Edward, the Black Prince (1330–1376). These manors were referred to as assessionable manors because they were leased under assession leases, which were renewed periodically.
The table below shows the 17 Antiqua maneria, including the number and status of Customary tenants in the early fourteenth century. The manors vary greatly in both size and importance. The parishes listed are the modern parishes, rather than those that existed in the 14th century.Hatcher, John (1970) Rural Economy and Society in the Duchy of Cornwall 1300-1500. Cambridge University Press; p. 76
| Conventionarii | Villani | Conventionarii | Nativi | Liberi Conventionarii | Nativi Conventionarii | Nativi de Stipite | ||
| Calstock of Harewood House | 14 | 53 | – | – | 29 | 49 | 8 | |
| Stoke Climsland | 23 | 81 | 25 | 69 | 28 | 49 | 18 | |
| Helston | 76 | 11 | 102 | 6 | 102 | 5 | 2 | |
| Helston in Triggshire (Helstone in Lanteglos); and Penmayne | 33 | 78 | – | – | 37 | 72 | 11 | |
| Liskeard | 41 | 26 | 46 | 36 | 49 | 34 | 4 | |
| Moresk in St Clement parish | 20 | 19 | – | – | 24 | 20 | 2 | |
| Penkneth in Lanlivery parish | 9 | 6 | – | – | 7 | 3 | 7 | |
| Penlyne in Lostwithiel parish | 22 | 2 | – | – | 20 | 1 | 1 | |
| Penmayne in St Minver parish | see | Helston in Trigg | – | – | – | – | – | |
| Restormel Castle in Lostwithiel parish | 2 | 12 | – | 15 | – | 8 | 8 | |
| Rillaton in Linkinhorne parish | 7 | 6 | - | – | 3 | 10 | 5 | |
| Talskiddy in St Columb Major parish | 2 | 1 | 4 | 3 | 3 | 3 | 0 | |
| Tewington in Treverbyn parish | 43 | 11 | 52 | 12 | 52 | 6 | 5 | |
| Tintagel (formerly Bossiney) | 14 | 28 | 25 | 30 | 26 | 30 | – | |
| Trematon in St Stephens by Saltash parish | 29 | 21 | 38 | 25 | 37 | 16 | 6 | |
| Tybesta, in Creed parish | 28 | 21 | 37 | 16 | 36 | 14 | 4 | |
| Tywarnhaile in St Agnes parish | 12 | 15 | – | – | 11 | 15 | 2 | |
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