The Psalter of Queen Philippa (BL Harley MS 2899)

Historiated initial containing the biblical King David, f. 8.

Colloquial name(s): The Psalter of Queen Philippa

Official name(s): British Library, Harley MS 2899

Date: 1328-1340 (source) 

Origin: England (source)

Online facsimile available via: British Library Online Catalogue of Illuminated Manuscripts

The Welles Apocalypse (BL Royal MS 15 D II)

Historiated initial containing the head of a woman, f. 7.

Colloquial name(s): The Welles Apocalypse
Official name(s): British Library, Royal MS 15 D II

Date: 1300-1325 (source)
Origin: England (source)

Online facsimile available via: British Library Online Catalogue of Illuminated Manuscripts

The Queen Mary Psalter (BL Royal MS 2 B VII)

People, possibly dancing, f. 173v.

Colloquial name(s): The Queen Mary Psalter

Official name(s): British Library, Royal MS 2 B VII

Date: 1310-1320 (source)

Origin: London/Westminster or East Anglia?, England (source)

Online facsimile available via: British Library Online Catalogue of Illuminated Manuscripts and British Library full facsimile

Updates!

The post about the Luttrell Psalter (British Library Additional MS. 42130) has been updated with full descriptions of all images.

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Très Riches Heures du Duc de Berry (Chantilly, Musée Condé, MS 65)

February, f. 2v.

Colloquial name(s): Très Riches Heures du Duc de Berry

Official name(s): Chantilly, Musée Condé, MS 65

Date: 1412-1416 (Limburg brothers' illustrations), 1420s or 1440s (further embellishments by an anonymous painter), 1485-1489 (illustrations completed or added by Jean Colombe) (source)

Origin: made for the French prince, John, Duke of Berry, France (source)

Online facsimile available via: Mirador (full, zoomable facsimile), Wikimedia Commons (next best online facsimile), Christus Rex (inferior online facsimile)