Question: When was the great uncle of the creator of the Broadway musical "Hamilton" and founder of the Puerto Rican Independence Party born?
Context: Lin-Manuel Miranda ( ; born January 16, 1980) is an American composer, lyricist, playwright, and actor best known for creating and starring in the Broadway musicals "Hamilton" and "In the Heights".  He co-wrote the songs for Disney's "Moana" soundtrack (2016) and is set to star in their upcoming film "Mary Poppins Returns".  Miranda's awards include a Pulitzer Prize, two Grammy Awards, an Emmy Award, a MacArthur Fellowship, and three Tony Awards. Filiberto Ojeda Ríos (April 26, 1933 – September 23, 2005) was the commander-in-chief ("Responsable General") of the Boricua Popular Army ("Ejército Popular Boricua, a.k.a., Los Macheteros").  According to an unsigned article in the "Los Angeles Times", Los Macheteros was “a terrorist group seeking Puerto Rico's independence.”  The group campaigned for, and supported, the independence of Puerto Rico from the United States.  In 2001, FBI Director Louis J. Freeh claimed the group was linked to acts of terrorism, but Ronald Fernandez, scholar of Puerto Rican history, suggests such labeling was an act of political convenience by the United States Government, intended to "shift the blame for any attacks on U.S. policy or personnel from us to them".  Ríos was also a founder of the FALN.  In a 1983 New York Times article, Robert McFadden described the FALN as a Puerto Rican terrorist organization responsible for bombings during the 1970s and early 1980s "in the name of Puerto Rican independence". Antonio Vélez Alvarado a.k.a. "The Father of the Puerto Rican Flag" (June 12, 1864 – January 16, 1948) was a Puerto Rican journalist, politician and revolutionary who was an advocate of Puerto Rican independence.  A close friend of Cuban patriot José Martí, Vélez Alvarado joined the Puerto Rican Revolutionary Committee in New York City and is among those who allegedly designed the Flag of Puerto Rico.  Vélez Alvarado was one of the founding fathers of the Puerto Rican Nationalist Party. David Noriega Rodríguez (1945 - May 4, 2013) was a Puerto Rican lawyer, politician, and political analyst.  He was one of the most relevant political figures in Puerto Rico during the last two decades of the 20th Century, when he was a member of the Puerto Rican Independence Party (PIP).  Noriega ran for Governor of Puerto Rico at the 1996 general elections.  Noriega became known as the "People's Prosecutor" because of his active role in pursuing government corruption.  His legislative investigations led to the discovery of many political corruption scandals that he referred to the US Federal Government.  In later years, Noriega served as a political analyst for various television and news programs. Dr. Leopoldo Figueroa (September 21, 1887 – October 15, 1969) a.k.a. "The deacon of the Puerto Rican Legislature", was a Puerto Rican politician, journalist, medical doctor and lawyer.  Figueroa, who began his political career as an advocate of Puerto Rican Independence, was the co-founder of the "Independence Association", one of three political organizations which merged to form the Puerto Rican Nationalist Party.  Figueroa, had changed political ideals and in 1948, was a member of the "Partido Estadista Puertorriqueño" (Puerto Rican Statehood Party).  That year, he was the only member of the Puerto Rico House of Representatives who did not belong to the Popular Democratic Party of Puerto Rico PPD, who opposed the PPD's approval of the infamous Law 53, also known as "Puerto Rico's Gag Law" and "Ley de La Mordaza", which violated the civil rights of those who favored Puerto Rican Independence.  On December 22, 2006, the Puerto Rican Legislature approved a law declaring every September 21, Leopoldo Figueroa Carreras Day. Vance Thomas is an attorney who former Secretary of Labor and Human Resources of Puerto Rico under the governance of Alejandro García Padilla in the 16th Cabinet of Puerto Rico.  Thomas was a former candidate for mayor of Culebra in 1992 for the Puerto Rican Independence Party and a former candidate for mayor of San Juan in 2000 for the same party.  In 2012, however, Thomas favored García Padilla during the Puerto Rican General Elections although they are from different political parties.  Thomas also led the Puerto Rico Commission on Civil Rights and the Puerto Rico Committee on the Conservation of Culebra's Seabed. Juan Manuel Dalmau Ramírez (born July 23, 1973) is a Puerto Rican politician, attorney and a former candidate for Governor of Puerto Rico for the Puerto Rican Independence Party.  He is currently a member of the Senate of Puerto Rico. María de Lourdes Santiago Negrón is a Puerto Rican lawyer and politician from Adjuntas.  She is the current vice-president of the Puerto Rican Independence Party (PIP) and in 2004 became the first woman from that party to be elected into the Senate in the history of Puerto Rico. Dr. Gilberto Concepción de Gracia (July 9, 1909 – March 16, 1968) was a lawyer, journalist, author, politician and founder of the Puerto Rican Independence Party.  He is the great uncle of maternal siblings Residente and ILE of Calle 13, and Lin-Manuel Miranda. Francisco María Susoni Abreu (September 11, 1875– November 28, 1954) was a Puerto Rican politician and senator.  He was a member of the first Puerto Rican Senate formed in 1917, representing the District of Arecibo.  He returned to politics in the 1940s, and was elected again as senator for the Popular Democratic Party (PPD).  Dr. Susoni was the first candidate for governor of the Puerto Rican Independence Party in 1948, political party founded in 1946 in spite of all the obstacles imposed by the colonial establishment.
Answer: July 9, 1909