Short answers, pulled from the story.
The Fifth Council of the Lateran was a Catholic ecumenical council that convened from 1512 to 1517. It assembled at Rome on the 19th of April 1512 with only Italian prelates present.
Pope Julius II summoned a general council by papal bull on the 18th of July 1511 to counter the schismatic council at Pisa. The necessity arose because French politicians decided to convene a schismatic council at Pisa in 1511 to depose him politically.
Age limits over thirty years were established for bishops to reduce nepotism and absenteeism. Stricter regulation of the Roman curia followed these measures including sumptuary regulations that restricted luxury spending by cardinals and bishops.
Leo X promulgated a Bull on the 4th of May 1515 sanctioning monti di pietà financial institutions. These provided no-interest microfinance loans to the needy under strict ecclesiastical supervision while another section asserted that lay people held no power over clerics.
Alessandro Geraldini attended the eleventh session as first Archbishop of Santo Domingo. He likely represented the first prelate from Western Hemisphere to attend an Ecumenical Council.