The Rebbe, Rabbi Menachem Mendel Schneerson, of righteous memory's, parents, Rabbi Levi Yitzchak Schneerson (1878-1944) and Rebbetzin Chana Yanovsky (1880-1964) were married on the 11th of Sivan, 1900. Their oldest son, Menachem Mendel, was born two years later, on the 11th of Nissan of 1902.
Links:
Rabbi Levi Yitzchak Schneerson
Rebbetzin Chana Schneerson
Marriage: an Anthology
Rabbi Yitzchak Yaakov Weiss, known as the Minchat Yitzchak (the name of the responsa he authored), was born in Galicia in 1902. He headed of the court of Jewish law, the Beit Din, in Grosswardein, Romania before WWII, and after miraculously surviving the war he assumed the same position in Manchester, England.
In the aftermath of the Holocaust he worked diligently on aiding the many women whose husbands disappeared, and presumably perished, during the war; finding halachic "loopholes" which allowed them to remarry according to Jewish law.
He authored a nine-volume set of responsa. In this widely-used work, he addresses many modern-day halachic issues which resulted from the technological explosion, as well as many medical ethics issues.
In 1979, he assumed the position of Av Beit Din (Head of Court) in the Edah Hachareidit, one of the most prominent rabbinical bodies in Israel. He served in this capacity for the remainder of his life.
He passed away on the 11th of Sivan. An estimated 30,000 people attended his funeral.
It is the custom of many communities (and such is the Chabad custom) to continue the weekly study of a chapter Ethics of the Fathers ("Avot"), one chapter each Shabbat afternoon, through through the summer, until the Shabbat before Rosh Hashanahn (the first six-week cycle is completed on the six Shabbatot between Passover and Shavuot). This Shabbat, being the first Shabbat after Shavuot, we study Chapter One.