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With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

Here is my solution for Bash 4:

delHistory () {
    count=$(( ${2:-$1} - $1 ))
    while [[ $count -ge 0 ]] ; do
        history -d "$start"
        ((count--))
    done
}

delHistory 511 520

With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

Here is my solution for Bash 4. It iteratively deletes a single entry or a range of history starting with lowest index.

delHistory () {
    count=$(( ${2:-$1} - $1 ))
    while [[ $count -ge 0 ]]; do
        history -d "$1"
        ((count--))
    done
}

delHistory 511 520

With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

Here is my solution for Bash 4:

delHistory () {
    start=$1
    end=${2:-$1}
    count=$(( end - start ))
    while [[ $count -ge 0 ]] ; do
        history -d "$start"
        ((count--))
    done
}

delHistory 511 520

With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

Here is my solution for Bash 4:

delHistory () {
    count=$(( ${2:-$1} - $1 ))
    while [[ $count -ge 0 ]] ; do
        history -d "$start"
        ((count--))
    done
}

delHistory 511 520

With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

With Bash 5 you can now do a range...Hooray!:

history -d 511-520

or counting backwards 10:

history -d -10--1

Excerpt from Bash 5 Man Page:

'history'

Options, if supplied, have the following meanings:

'-d OFFSET' Delete the history entry at position OFFSET. If OFFSET is positive, it should be specified as it appears when the history is displayed. If OFFSET is negative, it is interpreted as relative to one greater than the last history position, so negative indices count back from the end of the history, and an index of '-1' refers to the current 'history -d' command.

'-d START-END' Delete the history entries between positions START and END, inclusive. Positive and negative values for START and END are interpreted as described above.

Here is my solution for Bash 4:

delHistory () {
    start=$1
    end=${2:-$1}
    count=$(( end - start ))
    while [[ $count -ge 0 ]] ; do
        history -d "$start"
        ((count--))
    done
}

delHistory 511 520