Council Regulation No. 1103/97 on certain provisions relating to the introduction of the euro.
EU Council Decision No. 317/98, which legally anchored the members of the future single currency area.
Council Regulations Nos. 974/98 and 975/98. The former established the legal status of the euro as the single currency of the EU. The latter defined the technical specifications of euro coins.
Council Regulation No. 2866/1998 on the conversion rates between the 11 national currencies and the euro (subsequently the same for Greece in 2000).