Blanca Coin of Castile and León: Medieval Numismatics

Illustrated Specimen Details: Blanca Coin

Example Specimen: Blanca, 1471-1474 (Crown of Castile)

Historical Context: The Crown of Castile (1230-1715) was a medieval polity on the Iberian Peninsula formed by the union of the kingdoms of Castile and León. This state formation became the foundation for the Kingdom of Spain in 1715. This coin was minted during the reign of Henry IV of Castile (Spanish: Enrique IV de Castilla), who ruled from 1454-1474 and is historically known as "the Impotent". He was the final weak king of the late-medieval era of Castile and León.

Design Details: The obverse bears the Latin legend ENRICVS DEI GRACIA REX (Henry by the Grace of God, King) and the coat of arms of the Kingdom of Castile — a castle with three towers, windows, and a gate, a symbol used in Spanish heraldry since the 12th century. The reverse features the legend XPS VINCIT XPS REGNAT ("Christ conquers, Christ reigns", derived from the Laudes Regiae) and the coat of arms of the Kingdom of León, depicting a lion rampant. Both coats of arms are framed within rhombuses (diamonds). The abbreviation XPS represents Christus (Greek: ΧΡΙΣΤΟΣ).

1. SPANISH STATES (14th-16th centuries) — CROWN OF CASTILE (Kingdom of Castile + Kingdom of León): blanca = 1/2 maravedi = 1/60 real (ratios varied across historical periods).

History and Linguistic Origin

About the name of the coin "blanca": The name is derived from the Spanish word "blanca," meaning "white". This refers to the fact that the coin was initially struck in billon (extremely low-grade silver), giving it a white appearance. However, due to the very low silver content, the coins oxidized quickly and darkened, eventually looking indistinguishable from copper coins. It is arguably more accurate to classify the blanca as a copper coin with only minimal silver impurities. It should be noted that the French coin "blanc" is a distinct denomination.

Economic Role in Castile and León

The blanca was a small medieval coin widely used throughout the monetary systems of Castile and León during the late Middle Ages. As a low-denomination unit, it functioned as the essential currency for everyday retail transactions and market trade. During the 14th-16th centuries, the Spanish monetary system underwent frequent debasements and reforms, causing the value of the blanca relative to the maravedí and real to fluctuate significantly.

Numismatic Significance

Functioning similarly to other European petty currencies of the era, such as the denier or farthing, the blanca facilitated small-scale commerce in late medieval Spain. These coins remain a vital area of study for numismatists, offering insight into the economic history of the region as it transitioned from feudal standards toward the integrated monetary systems of the early modern Spanish Kingdom.