- Knotesford, John, -15891
- Knowledge, Theory of (Religion)1
- Kyrie eleison (Music)1
- Kölner Dom1
- Labyrinths1
- Ladron de Guevara family1
- Lamberto, Jacopo di1
- Lamoignon de Basville, M. de (Nicolas), 1648-17241
- Lamucci, Corso1
- Lanaiolo, Gherardo1
- Land tenure--Law and legislation1
- Landlord and tenant1
- Language and languages1
- Language and languages--Philosophy1
- Lanvers, Hamo1
- Lapidaries (Medieval literature)1
- Last Supper1
- Laterino, Cristoforo1
- Laterino, Pietro1
- Lathom, Robert de, 13th century1