What series of wars in (the middle east) left such of europe needing money?

Middle Eastern wars that have had a negative effect on Europe's economy include conflicts set on different historical periods.

The Crusades, which occurred between the 11th century to the 13th century, were highly expensive, and so, acted as major factors in the decrease of European wealth at the time (save for Italy, where positive effects were noticed).

More recently, the Yom Kippur War, a war fought between Israel and Arab countries led by Syria and Egypt, caused the 1973 oil crisis, after the United States of America's decision to support Israel. The OAPEC (Organization of Arab Petroleum Exporting Countries) then decided to promulgate an embargo in response. The embargo ended up raising the oil price from US$3 to US$12, deeply affecting the global economy of the time.

There has been many wars in the Middle East with devastating consequences for Europe's economy. These conflicts have occurred in different periods of history.

The most significant of these wars were The Crusaders which happened in the 11th to the 13th century. Christianity was spreading around the world, and they set out to eliminate other religions in the Middle East in places like Turkey and Iran.

These religious wars as they came to be known were very expensive for Europe. European wealth began to diminish very rapidly.

Now jumping to more recent times, Israel and other Arab countries led by Syria and Egypt were engaged in the Yom Kippur war which caused the oil crisis of 1973. The Arabs wanted to punish the United States for supporting Israel. The price of oil went from $3 to $12 thus creating a global economy crisis.