Many streets in Israel are named after Eli Cohen - Israel's "greatest spy." Cohen was 42 when he was hung in Damascus on May 18, 1965, after his cover as an Arab businessman had been blown.

That cover had allowed him to form close relationships with senior Syrian army officers and government officials. He conveyed invaluable information to Israel, warning of a planned Syrian strike on the National Water Carrier and providing information that led to Israel's defeat of the Syrian army in the Six-Day War.

Cohen's role was exposed by a sophisticated system Russia had supplied to the Syrians, which enabled them to intercept some of Cohen's transmissions to Israel. After being severely tortured, he was tried by a military tribunal and was hung in Al-Marja Square in Damascus.

In his last letter to his wife Nadia, he asked her to go on with her life, to remarry, "so our three children will have a father." But Nadia's grief lifted only 23 years later with the birth of her first two grandchildren, twin boys: Elad and Eliran.

The Cohen family has launched a commemorative Internet site, one main element of which is eucalyptus trees, to recall the trees Cohen urged the Syrians to plant on the Golan Heights, supposedly to camouflage their positions, but which actually marked them for Israeli pilots.