Question: When did Mendo Nunes's father die?

Knowledge 1: Mendo Nunes
Mendo Nunes (Spanish: Menendo Núñez; (1020/10281050/1054) was a Count of Portugal from the family of Vímara Peres as the son of Nuno Alvites and Ilduara Mendes. [SEP] Knowledge 2: Nuno Alvites
Nuno Alvites, also referred to as Nuno or Nuño Aloitiz ("fl." 10171028), was a count of Portugal, a descendant of the first count, Vímara Peres as the son of Count Alvito Nunes and Gontina.His presence is recorded for the first time in 1017.He appears in 1025 confirming a donation made by King Alfonso V of León to Nuno's brother, Pedro Alvites and again in that same year in another charter in which he states that he succeeded his father Alvito.He ruled the county with his spouse Ilduara Mendes, daughter of earlier count Menendo González, until he was assassinated in 1028, the same year as the death of King Alfonso V. Ilduara continued to rule the county, with her son Mendo, who was still a child, as regent after her husband's death.
Knowledge 1: Nuno Alvites
Nuno Alvites, also referred to as Nuno or Nuño Aloitiz ("fl." 10171028), was a count of Portugal, a descendant of the first count, Vímara Peres as the son of Count Alvito Nunes and Gontina.His presence is recorded for the first time in 1017.He appears in 1025 confirming a donation made by King Alfonso V of León to Nuno's brother, Pedro Alvites and again in that same year in another charter in which he states that he succeeded his father Alvito.He ruled the county with his spouse Ilduara Mendes, daughter of earlier count Menendo González, until he was assassinated in 1028, the same year as the death of King Alfonso V. Ilduara continued to rule the county, with her son Mendo, who was still a child, as regent after her husband's death. [SEP] Knowledge 2: Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.The other current books in the" What is?" series includeWhat is Love?,What is Death?,What is Beautiful?,What is Funny?,What is Right?,What is Peace?,What is Money?,What is Dreaming?,What is a Friend?,What is True?,What is a Family?,What is a Feeling?"The series is now also translated into 15 languages.Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.Boritzer now lives in Venice, California and maintains his publishing office there also.He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
Knowledge 1: Mendo Nunes
Mendo Nunes (Spanish: Menendo Núñez; (1020/10281050/1054) was a Count of Portugal from the family of Vímara Peres as the son of Nuno Alvites and Ilduara Mendes. [SEP] Knowledge 2: Harry Wainwright (footballer)
Harry Wainwright( born 1899; date of death unknown) was an English footballer.

Answer: 1028