William Parker

https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0... Monteagle died at his Essex residence, Great Hallingbury, on 1 July 1622, where he was also buried. He was succeeded by his son Henry, and a further five children—William, Charles, Frances, Elizabeth, and Katherine—are mentioned in his will, drawn up shortly before his death.

The National Dictionary of Biography gives the dates for William as 1607-1637. He did not marry or have issue [when his nephew Thomas Parker died in 1686, the titles went into abeyance and the only issue noted were those of Katherine married to John Savage; Earl Rivers & Elizabeth married to Edward Cranfield.