Spain in Fausset's Bible Dictionary

Solomon's fleet visited Spain, then named Tarshish (the Greek "Tartessus"). In classic times the name "Spain" came into use, traceable to the Basque Ezpana, i.e. on the edge of Europe. The Iberian language (from whence the country derived one of its names and its river Iberus or Ebro was designated) was the original of the Basque. Romans 15:24; Romans 15:28, Paul's intention to visit Spain may imply that a Christian church was already founded there. As to the early introduction of Christianity, compare Irenaeus 1:3 and Tertullian, Adv. Judg., 7.

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