Question: Who is Alboino I Della Scala's paternal grandfather?

Knowledge 1: Alboino I della Scala
Alboino I della Scala( – 29 November 1311) was the Scaliger Lord of Verona from 1304 until his death.He was the son of Alberto I della Scala, and became seignior and imperial vicar in the city after the death of his brother Bartolomeo in 1304.In 1298 he had married Caterina Visconti, daughter of Matteo I Visconti; eight years later Alboino remarried with Betrice, daughter of Gilberto III da Correggio.He was succeeded by the joint government of his son Alberto under the tutelage of his brother Cangrande.Alboino's younger son Mastino ruled Verona after the latter's death in 1329. [SEP] Knowledge 2: Alberto I della Scala
Alberto I della Scala( died 3 September 1301) was lord of Verona from 1277, a member of the Scaliger family.The son of Jacopino della Scala, he was" podestà" of Mantua in 1272 and 1275.In 1277, after the assassination of his brother Mastino, inherited the seigniory of Verona.Alberto died in Verona in 1301.His son Bartolomeo succeeded him.His other sons Alboino and Francesco( Cangrande) were also lord of Verona from 1304 and 1312, respectively.His daughter Costanza married Obizzo II d' Este, Marquis of Ferrara, as his second wife.
Knowledge 1: Alboino I della Scala
Alboino I della Scala( – 29 November 1311) was the Scaliger Lord of Verona from 1304 until his death.He was the son of Alberto I della Scala, and became seignior and imperial vicar in the city after the death of his brother Bartolomeo in 1304.In 1298 he had married Caterina Visconti, daughter of Matteo I Visconti; eight years later Alboino remarried with Betrice, daughter of Gilberto III da Correggio.He was succeeded by the joint government of his son Alberto under the tutelage of his brother Cangrande.Alboino's younger son Mastino ruled Verona after the latter's death in 1329. [SEP] Knowledge 2: Mastino II della Scala
Mastino II della Scala( 1308 – 3 June 1351) was lord of Verona.He was a member of the famous Scaliger family of northern Italy.He was the son of Alboino I della Scala and Beatrice da Correggio.At the death of Cangrande I, he and his brother Alberto II were associated in the rule of Verona.Soon, however, Mastino's independent attitude overshadowed the brother's presence.In the first part of his reign, abandoning the careful policy of balance held by his father, he conquered Brescia( 1332), Parma( 1335) in Lombardy and Lucca( 1335) in Tuscany.However, the extension of Mastino's power spurred the creation of League of all the other local powers( Florence, Siena, Bologna, Perugia and Venice).In the first year of war he managed to resist, but in 1336 the League was joined by Azzone Visconti of Milan, the Este of Ferrara, the Gonzaga of Mantua and the Papal States.Surrounded by every side, he could only ask for a treaty of peace through the intermediation of Emperor Louis IV of Bavaria, which he obtained in 1339.His territories were restricted to Verona and Vicenza, the remaining part split among the victorious enemies.An attempt to recover part of his lands with the German mercenaries that had remained in Vicenza after the war, led by Lodrisio Visconti, was unsuccessful.He died in Verona in 1351.He is buried in the Gothic mausoleum near the church of Santa Maria Antica, in one of the Scaliger Tombs.
Knowledge 1: Alboino I della Scala
Alboino I della Scala( – 29 November 1311) was the Scaliger Lord of Verona from 1304 until his death.He was the son of Alberto I della Scala, and became seignior and imperial vicar in the city after the death of his brother Bartolomeo in 1304.In 1298 he had married Caterina Visconti, daughter of Matteo I Visconti; eight years later Alboino remarried with Betrice, daughter of Gilberto III da Correggio.He was succeeded by the joint government of his son Alberto under the tutelage of his brother Cangrande.Alboino's younger son Mastino ruled Verona after the latter's death in 1329. [SEP] Knowledge 2: Bartolomeo II della Scala
Bartolomeo II della Scala( died 12 July 1381) was lord of Verona from 1375 until his death, together with his brother Antonio I della Scala.The illegitimate son of Cansignorio della Scala, he obtained the power in Verona after the latter's death by assassinating Cansignorio's brother, Paolo Alboino.He ruled Verona, who was then in bankruptcy and forced to accept the protectorate of Bernabò Visconti.After a period of moderate reign, Bartolomeo was assassinated by his brother Antonio.< BR>

Answer: Jacopino della Scala