Dear Michel,

the first four councils were held in ancient India, which has
different borders at the time of each council. The fourth council was
held during the reign of King Kaniska, who was of a Turkestani tribe.
His grandfather set up a huge kingdom in the then northern India.
Please correct me if I am wrong.

A quick timeline is available here:
http://www.buddhanet.net/e-learning/history/b_chron.htm

Metta
Yong Peng

--- Michel Henri DUFOUR wrote:
The Sangayana was held in the city of Jalandhar in present
Afghanistan. What did this Council consist of? Up to now I considered
that the 4th sa.ngaayana had been held in Sri Lanka.