References: G & B - Medieval European Conage, by Grierson and Blackburn; FREY - The Dated European Coinage Prior to 1501 by Albert R. Frey; ROBERT - The Silver Coins of Medieval France, 476-1610, by J. N. Roberts

All portrait deniers of the Carolingian Kings are scarce to rare.
Denomination: Silver denier.
Mint: Melle in Aquitaine
Size: 17.6 x 19.6 mm. Weight: 1.49 grams.
Reference: MEC vol 1, #758.
Grade: good Fine but with a ragged flan (the ragged area does not have a sharp edge that one would expect if a coin broke after striking, so I believe it was struck on a ragged flan). Nicely toned.
Obverse: Portrait of Louis the Pious right, with HLVDOVVICVS IMP AVG around.
Reverse: Minting tools, with METALLVM around.

This is a particularly interesting type for Louis the Pius, in part because it has his portrait, but also because the reverse shows dies and hammers, representing the medieval minting tools of that time.

Denomination: Silver grand blanc aux ecus.
Mint: Paris (mint mark crown).
Date: second type issued after the 6th of September 1423.
Reference: Elias-264.
Size: 26.6 x 26.9 mm.  Weight: 3.46 grams.
Grade: gVF and nicer than the image suggests.
Obverse: Shields of France and England, with the Virgin Mary and the angel Gabriel above, with HENRICVS DEI GRA FRANCORV Z AGILE REX around.
Reverse: Latin cross flanked by a fleur-de-lis and a leopard, with an h below, all in a tressure of ten arches, with XPC VIHCIT XPC REGHAT XPC IMPERAT around.

Richard I, known as Richard the Fearless, came into power in Normady upon his fathers death in AD 942 at the age of 8 to 10 years, but Louis IV of France immediately seized Normady and put him in confinement. With the help of other Norman and Viking leaders, Richard escaped and reclaiming Normady in AD 947. 
Denomination: Silver denier.
Mint: Rouen.
Size: 18.7 x 19.3 mm. Weight: 1.06 grams.
Reference: D-18
Grade: gVF with some weakiness on some of the lettering, and the lettering is crudely engraved, as is normal for this issue.
Obverse: Short cross with a pellet in each quadrant, with RICARDVS around.
Reverse: Monogram of Bishop Hugues, with ROTO MAGVS around.

Hugues was Bishop of Rouen from AD 942 to 989.

This Richard has no connection with Richard the Lionheart of England, predating him by more than 200 years.

While very similar to the his Italian issues as King of Naples, this coin was struck in France as Count of Provence.
Denomination: Silver Gigliato (or Carlini).
Mint: Avignon.
Reference: Rol-51.  PdA-3982.
Size: 23.8 x 24.3 mm.  Weight: 3.48 grams.
Grade: VF, nicely toned.
Obverse: Robert seated with a lion to each side, and holding a globus cruciger and sceptre, with ROBERT DEI GRA IERL ET SICIL REX around.
Reverse: Cross fleurée, with a lis in each angle, with COMES PUINCIE ET FORCALQERII around.

References: G & B - Medieval European Conage, by Grierson and Blackburn; FREY - The Dated European Coinage Prior to 1501 by Albert R. Frey; ROBERT - The Silver Coins of Medieval France, 476-1610, by J. N. Roberts