private static final Pattern OMIT_DIGITS = Pattern.compile("\\d+ (?<value>.+)");
private final Collection<String> values = HistoricalFigures.get();

@Override
protected void execute() {
    Collection<String> valuesWithoutId = new ArrayList<>();

    for (String value: values) {
        Matcher m = OMIT_DIGITS.matcher(value);

        if (!m.find()) {
            continue;
        }

        valuesWithoutId.add(m.group("value"));
    }
}