Award-winning author and historian James L. Nelson will discuss his new novel, “Fin Gall” that tells the history of Viking raids and settlements in medieval Ireland and how Norse and Irish cultures influenced each other. Nelson will sign copies of his book. 

WHEN: 2 p.m. Sunday

WHERE: Maine Irish Heritage Center, 34 Gray St., Portland

HOW MUCH: $5

INFO: 780-0118; www.maineirish.com