“Joe Percoco is paying the price for violating the public trust,” Mr. Cuomo said. “And it should serve as a warning to anyone who fails to uphold his or her oath as a public servant.”

The bulk of the bribes came in the form of a “low-show” job given to Mr. Percoco’s wife, Lisa Toscano-Percoco, by an energy company, Competitive Power Ventures, which had wanted to build a power plant in the Hudson Valley.

[Want to know more about Joseph Percoco, and why his conviction matters? Read more here.]

Prosecutors had sought to show that Mr. Percoco, in addition to taking bribes, flouted state ethics rules openly and with impunity. At one point, they introduced swipe data showing that Mr. Percoco entered and exited the governor’s taxpayer-paid office even after he left state government to work on Mr. Cuomo’s campaign. After the trial ended, Mr. Cuomo seemed to acknowledge that he had been aware of Mr. Percoco’s presence, although he said he thought Mr. Percoco was there to handle “transition matters.”

In building its case against Mr. Percoco, the government relied heavily on another longtime Cuomo family ally: Todd R. Howe, a longtime lobbyist and Albany insider who had been a mentor to Mr. Percoco.

Prosecutors said Mr. Howe arranged for the bribes to be paid to Mr. Percoco by the power company, CPV, and a Syracuse-based developer, COR Development, which were both Mr. Howe’s clients.

When prosecutors announced the charges against Mr. Percoco in 2016, they also revealed that Mr. Howe had pleaded guilty to eight felonies and was cooperating with the government.

During the trial, Mr. Howe risked unraveling the government’s case when he admitted under cross-examination that he had tried to defraud a credit card company, violating the terms of his cooperation agreement and tainting his credibility as a witness in real time. He was jailed but continued to testify in the trial.