Who is Cesar Vallejo from Pablo Neruda: Selected Poems and what is their importance?

Cesar Vallejo was a Peruvian poet who lived from 1892-1938, and was considered one of the most innovative poets of the 20th century. Neruda looked up to Vallejo, and even wrote an ode about him, In this Ode to Cesar Vallejo, Neruda describes him as having a stony face, an enormous forehead, and a fragile body. Neruda laments the time running out for Vallejo and likens it to sand falling through an hourglass. In the ode, he talks about Vallejo's time in Spain and Paris, and about his exile first from Peru and then from the earth itself. Neruda admits that he never missed his friend in life but in death, he does.