Geomancy (from the Greek geomanteia — divination from earth) originated in the African and Arabian deserts, where practitioners drew random patterns of dots in sand or earth and interpreted the resulting configurations. The tradition entered European consciousness through Arabic transmission in the 10th–12th centuries — the Arabic name khatt al-raml (tracing in sand) appears in texts that were translated into Latin by Hugh of Santalla and others.
By the Renaissance, geomancy had become one of the seven "forbidden arts" alongside necromancy, hydromancy and others — and simultaneously one of the most respected technical divination systems among scholars. Henry Cornelius Agrippa devoted a substantial section of his Three Books of Occult Philosophy to geomancy; Christopher Cattan's Geomancy (1558) became the standard European reference. John Dee practiced it; so did generations of English cunning folk.
The system's intellectual respectability derived from its close relationship with astrology. The sixteen geomantic figures each correspond to a planet and a zodiac sign; the full geomantic chart (the Shield and House Chart) maps the figures onto an astrological house structure, producing readings of comparable complexity to horoscopic astrology.