Wittenberg. 1517. Church door on which Luther posted his 95 Theses.

Woodstock. 1969. US Rock festival attended by 300,000.

Xenophon. 431-350BC. Greek general/historian. Expedition of Ten Thousand. Anabasis. Hellenica.

Yggdrasill. Ash tree of existence, life and knowledge in Scandinavian legend.

Yoga. Hindu and Buddhist system of meditation, breathing and exercise to achieve spiritual enlightenment.

Yugoslavia. Balkans. 1918 Kingdom of Serbs, Croats, Slovenes. 1929 =Yugoslavia. 1929-31 Dictatorship. 1941-45 Italy, Germany occupy. 1945 Socialist Federation of Republics. 1948 Broke Soviet ties. 1991 -Croatia, Slovenia, Civil war. Serbia. Croatia. Bosnia-Hercegovina. Slovenia. Macedonia. Montenegro. Tito. Kosovo.

Zen Buddhism. 6C-. Sect founded by Bodhidharma. Sudden Enlightenment by meditation on Koan paradoxes. 1191 imported to Japan.

Zurbaran, Francisco de. 1598-1664. Spanish religious Baroque tenebrist painter. Monk 1630.

Ark of the Covenant. Built by Moses to house 10 Commandments.

Deuteronomy. 5th Book of Bible. Includes 10 Commandments and other laws. Law code found c622BC in Temple of Jerusalem.